Malicious PDF — malware analysis report

Static analysis result for SHA-256 af06c1da4df82373…

MALICIOUS

PDF

91.8 KB Created: 2021-03-31 21:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f19b320d66c6af3b522dabb245da75ca SHA-1: d7ee9df85016a3337d29d9b08d93fe93bc1257d4 SHA-256: af06c1da4df82373977a7c62f1488a3355574a6e813f1f30f30227418a9ed841
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://vilenefex.ru/123?utm_term=adjectives+worksheet+5th+grade+pdf', suggests a phishing or scam attempt disguised as educational material. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/123?utm_term=adjectives+worksheet+5th+grade+pdf
    • http://lufijep.iblogger.org/android_box_x10_plus.pdf
    • https://cdn.sqhk.co/dobexesi/XJpddyQ/vector2_normalize_godot.pdf
    • https://cdn.sqhk.co/temetixufuxi/Hhihiih/lamitedaperogalotezad.pdf
    • https://nuguzawopaji.weebly.com/uploads/1/3/4/0/134040365/sagupeba.pdf
    • https://cdn.sqhk.co/vumusokutil/hqKgeja/45763709796.pdf
    • http://xevimajitufom.iblogger.org/dream_about_apple_worms.pdf
    • http://pomanonorajalam.22web.org/sentencia_caranchoa.pdf
    • https://cdn.sqhk.co/rorajakura/Khiiggd/94673076883.pdf
    • https://panesiwosejel.weebly.com/uploads/1/3/0/7/130739396/foduzo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_7eda88876f824753b3de5a5267a45f57.pdf?index=true
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_82a12b5087074704a496eba1f2150a51.pdf?index=true
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_4992ff6867dc4b02a8306aa75cb83b7e.pdf?index=true
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_ad7b756e99f1433db48aad083808b215.pdf?index=true
    • https://6680615c-3592-42a6-94f3-b98e474b5330.filesusr.com/ugd/252546_6699e80a6e52451381e0279dc885d110.pdf?index=true
    • https://36fde204-cda4-4268-899b-58717f9005d0.filesusr.com/ugd/b13063_afc15acdee164c518ed0ac412d6b964d.pdf?index=true
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_bb05a1ab0d6847078520da164185dbf6.pdf?index=true
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_07e36ea723fd4d8aae8f02bd51d79316.pdf?index=true
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_70b210bcf347451884a826adad0103a3.pdf?index=true
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_70d6ca521411498c902656ea70a5b936.pdf?index=true
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_99fe311ab35c43299a9a3654cb0b8b02.pdf?index=true
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_af15c7bb6e7f4fe48b2b717665da0e33.pdf?index=true
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_d2e6ea1aceb24cc5a9b3693e96b7060b.pdf?index=true
    • http://vujewim.epizy.com/confirmation_invitation_templates_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111e5.bin
621bf2adb1c96a9754071ebbdaea8ab14081819d5da7316b222e21cf49f13af8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111E5 5792 bytes
font_01_sfnt_off000125ba.bin
44736b61fd39cdb8d8db1de74c37ef442fb39bbcde17e4cb94d8b73d08cd2c57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125BA 11564 bytes
font_02_sfnt_off00014c86.bin
1eb1a67c1e28174fcd3182c8c51ea08124a48e64646cffb6854bb4c979508c4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C86 16104 bytes

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