Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c119cd1cfbc651b…

MALICIOUS

PDF

84.8 KB Created: 2021-04-09 08:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 48faa25740a7a97aa240115dc6f010fd SHA-1: cf76761b42cd4f1cd77a05ff0a57d7a7e9a7a4e0 SHA-256: 0c119cd1cfbc651b603dd59f6136f8acb5142f7fc0de1cf3c5dff2a70eddbc6f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with a significant number pointing to disposable hosting, suggesting a link farm or SEO spam operation. One prominent URL, 'https://leonvi.ru/strik?utm_term=why+is+my+whirlpool+refrigerator+not+getting+cold', is presented as a search result for a common appliance problem, likely to attract unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/strik?utm_term=why+is+my+whirlpool+refrigerator+not+getting+cold PDF link annotation
    • http://perevod24-card2card.site/zekiwikilio1xsb.pdfIn PDF document text
    • http://vipadminler.org/fezinudoropov7pi.pdfIn PDF document text
    • http://jsexj.fun/81598916712ww9n0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_89759b16d76446fbb8f3be71915e86a1.pdf?index=trueIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_544da90d82dd4dd998c77d9aa5111145.pdf?index=trueIn PDF document text
    • https://245df057-3761-468b-8bc4-2c9c6734f7c7.filesusr.com/ugd/06c8e1_a00f181a09ec48c983aaef9da81e734e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04e77a44-09bf-4d08-8131-8cfedc588fa8/42021012934.pdfIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_b1295017a9b642f681753f7dda43166b.pdf?index=trueIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_faf40d7db404453c82f122b6c95214b8.pdf?index=trueIn PDF document text
    • https://e24ff460-1725-4b9d-a7de-f8438c38fea0.filesusr.com/ugd/366850_212743cf2dcb465f97443a261815f9df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b64b010-8f65-4a39-bb09-3c78436b1e66/24129858471.pdfIn PDF document text
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_8cda2e58ed794478ab5051cb881d314e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/daselex/ios_12._4_for_iphone_6.pdfIn PDF document text
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_70fc29bb815741d0b3468887de0d4e39.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xisefowu/befumekisilobumuzofunegu.pdfIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_72bde07d3c3c407f873cf6e66218cf6a.pdf?index=trueIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_cc7654463023423daba803ba3aa4c4f2.pdf?index=trueIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_1b994524ddb045b2b5edb425d7736ffd.pdf?index=trueIn PDF document text
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_37605a10502143868aec65a165e1983e.pdf?index=trueIn PDF document text
    • https://52aa71f3-9574-4e96-898b-bb16aa893b2c.filesusr.com/ugd/b13a71_e7066d57aff2409ca6d4ecd449f6a741.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/how_much_is_it_to_ship_internationally_with_fedex.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/71527991534.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5458feb4-4bfa-464d-ad1b-b4a787c53a92/42154202209.pdfIn PDF document text
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_455e47d7c61d4666b431dfc8a04c47eb.pdf?index=trueIn PDF document text
    • https://60883313-e483-4213-bdf2-3844198a3b35.filesusr.com/ugd/3ba96b_37d58ffed4ec4002872b17e5ef03c58c.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC4 5564 bytes
SHA-256: 07eed91672acc76aefc2f10683dc746ec2f4b5f44e5123ada974ddb5ba9efe67
font_01_sfnt_off0001129c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129C 10604 bytes
SHA-256: 63674039e716599d47221493611059e0b670ef4750057b1e2d35bedd74feb37d
font_02_sfnt_off000136eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EB 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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