Malicious PDF — malware analysis report

Static analysis result for SHA-256 30bd72e9507bb97b…

MALICIOUS

PDF

79.7 KB Created: 2021-03-14 09:07:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f45a134261f1d0633c4d757fe86159ce SHA-1: 7b5ae95a32e3a23989b6d104ca71cb74acdbae74 SHA-256: 30bd72e9507bb97bd2fe1d70a774036504d96280bdcd140f5f4a70189f0f75d1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, including ClamAV detecting it as a phishing trojan. It contains a large number of embedded external links, suggesting a link farm or phishing attempt. The presence of these links indicates an attempt to redirect the user to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/123?utm_term=oxford+bookworms+pdf+indir PDF link annotation
    • https://cdn.sqhk.co/vuwipabobatu/acnhgif/zumawumufewudufinuno.pdfIn PDF document text
    • https://cdn.sqhk.co/mewivupa/f5wiejc/vopikunojiwujujejoserexev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465257/normal_5fe7effd49e94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480414/normal_601152e9822cf.pdfIn PDF document text
    • https://cdn.sqhk.co/wafixagi/ghieibH/triller_music_video_maker_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/ijajhYt/ecology_examples_geography.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://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_d609a21d403e496482472ea6133dc41f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e8fa24e-ce3a-4c45-93a4-29381e98b824/foredutemud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8929a650-787b-4dc8-9e72-805a10079b99/dejazawigojuzadinuxafixuv.pdfIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_1c8532649be1431d812430ba0b162b91.pdf?index=trueIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_e7ff60c4f1434815bd8c48b9ed85c110.pdf?index=trueIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_a4db79dabace4e0c9a28e1a631556a6c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/88ec1d21-b0e3-4da5-a18e-961019f5d400/48799017121.pdfIn PDF document text
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_a3ce984ee9044a609736a38a1651694b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04578756-970d-4636-8bc9-40ec84899ba9/nikigegepobe.pdfIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_33b9bc469eb64d2c9dd0254e069d278d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4184c5a3-ac32-4640-bec1-79a2e57ba7e1/sivufiwokonabidarafo.pdfIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_45a33a5a9ea3473c9a0d2735818b4816.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94B 4928 bytes
SHA-256: 325bc7493fbe79b0b7aa3f8d0f7ad6b673c3c01ff0fada5ef025a54b122d8ff3
font_01_sfnt_off0000e9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F8 10496 bytes
SHA-256: 8e85f00bfbcd431432c2bb532787fc3ea583a8f07c18e6d6e62e7119f802efee
font_02_sfnt_off00010de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE8 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953
font_03_sfnt_off00012282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12282 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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