Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4c7c3084368dc8…

MALICIOUS

PDF

76.6 KB Created: 2021-04-08 17:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5f2f82cc426482480f247a89f7d1a8e2 SHA-1: 0846726879db9e63558ff0745ffb57c7dd683cec SHA-256: ec4c7c3084368dc8cfa1b18a7cdd15a5422b9576ae9177f319a373b7ce7df7bb
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/strik?utm_term=best+new+ethiopian+names PDF link annotation
    • https://cdn.sqhk.co/wogirujut/viaYjdG/zomusafupezam.pdfIn PDF document text
    • http://best-store.club/wahl_pro_clip_clipper_amazon7kxxv.pdfIn PDF document text
    • http://boomua.site/turkish_airline_stewardess_uniformsxmt7y.pdfIn PDF document text
    • https://cdn.sqhk.co/febapaji/hdkR2ZI/lfc_player_ratings_this_is_anfield.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/Gejiheo/86073139145.pdfIn PDF document text
    • https://cdn.sqhk.co/kifukuvitog/idzABrT/edge_lighting_live_wallpaper_new_border_edge_lighting.pdfIn PDF document text
    • http://avto-trokot.xyz/93104017457d4yb2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_dfc0b7ae24cb49c489e43f76dddba1f1.pdf?index=trueIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_069418ec0a3b400ebd92dffaa1a2aa76.pdf?index=trueIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_4b64ecc1c9f4442bacae7d66c4dc047b.pdf?index=trueIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_6e2c50143c014d4aa6886f126adb8bcc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fizup/32129847987.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_f78dee25916f43dcbec5430e006783ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bepukuba/starcraft_2_legacy_of_the_void_walkthrough.pdfIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_41ad3b6a4e164a8ca148af28678addd4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vufupu/reference_sheet_for_math_6-_8.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/38991924522.pdfIn PDF document text
    • https://e321b6f2-2a0a-4c58-8c60-26baf46d82f1.filesusr.com/ugd/14900c_344872b43cb5425f98e78f2f5cef40ba.pdf?index=trueIn PDF document text
    • https://3caa4030-7dd6-4be4-8a8a-e1981c45b3cd.filesusr.com/ugd/704988_0a59578eba174298944a8fb2fa93e21a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/77652842986.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 5072 bytes
SHA-256: 37e1045a4673333a149b6caf834ba762be5a045cff7fc6f0a92ea6cd3ee55033
font_01_sfnt_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 10604 bytes
SHA-256: 001704310056f2a120d45f29150137bf51f727055d81429091db85c4f0913009

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