Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b211efa8b36ea4…

MALICIOUS

PDF

76.2 KB Created: 2021-03-18 21:31:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0e3be56d5d0f74ba1508a5a2a43b193a SHA-1: 7343d17667b7da53d41a89795f76ef04753d6b8d SHA-256: f8b211efa8b36ea4a4ed16065181b09dca7916f798cdfcdcce19a9d3508333e9
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant portion pointing to disposable hosting and potentially malicious domains. The 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=asus+designo+mx279h+monitor+-+27+fhd%25281920x1080%2529 PDF link annotation
    • http://axecheat5.xyz/jaxotarafibapaguwujedak7qim3.pdfIn PDF document text
    • http://domavera.ru/coursera_introduction_to_big_data_quiz_answers3a2sw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451365/normal_5fcf4de2c91d5.pdfIn PDF document text
    • http://pearhaidhr.fun/earthlink_webmail_help_desk386mi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491669/normal_5fd0da5da6716.pdfIn PDF document text
    • http://nimojojisox.22web.org/wutusizanalubeledab.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://uploads.strikinglycdn.com/files/fb97cf1c-069e-4f15-8de2-c82918c4262a/why_were_the_iliad_and_the_odyssey_important.pdfIn PDF document text
    • http://zetipetarot.rf.gd/49577126881.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc219b59-56b0-4c9d-9635-438a8aa8a473/88245148308.pdfIn PDF document text
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_da6f59c6b5e64b9189e44077a231d739.pdf?index=trueIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_0666b41498f44dd399f9d07fe2abb6f9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7301b198-6759-4f33-a0b4-8b7c6f201593/what_time_does_stock_market_open_arizona_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d178e825-60c0-4f82-9f4d-1a446da288d7/88593932621.pdfIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_c91f08c45ddd4b32b5ae4d778be95f29.pdf?index=trueIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_4430b2331f6541a7938f3d7d2dea4a48.pdf?index=trueIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_32b335c346e74a46816faea624f07bdd.pdf?index=trueIn PDF document text
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_981c9e8a540e4a86a32b130e6224c63d.pdf?index=trueIn PDF document text
    • https://510b81f6-be4e-4e40-9acf-3f60af495837.filesusr.com/ugd/5f226b_b9f2f13509de49f8b0fbf140f11d9410.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8850a4ec-9671-4619-8bdd-59db83f4e5a4/jalefeboduxixafa.pdfIn 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_off0000d6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C6 5960 bytes
SHA-256: bea6ea7ced4f17e4abbbd4c40ab8ed1566d1f7a90b45e0d2512dd68b8e771652
font_01_sfnt_off0000eb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB00 12088 bytes
SHA-256: 1654a082ef4351b6557aa38dd8de8d29ce81113d7c5e5bc1da5001429d4ebd6a
font_02_sfnt_off00011382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11382 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361