Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6264775eabd44cc…

MALICIOUS

PDF

82.4 KB Created: 2021-05-03 08:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a217a4bf4d18b5661e3153123510932 SHA-1: 7d9163c171058594106710ca849dff1b112e73f5 SHA-256: b6264775eabd44cc5b9e3961a70fab707e7ec63b07cb4b28a0349bccc0bd2e14
226 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may instruct users to decrypt an archive, a common tactic to bypass gateway security. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://midufefew.ru/strik?utm_term=craftsman+315+garage+opener+battery
    • http://outputqwvk.space/attestation_employeur_pole_emploi_remplissabler48cs.pdf
    • https://cdn.sqhk.co/nuzozuni/jgcifio/xbox_series_x_gamestop_restock.pdf
    • https://nejotadig.weebly.com/uploads/1/3/1/1/131164569/3085824.pdf
    • https://jipotawa.weebly.com/uploads/1/3/6/0/136097183/94748d.pdf
    • https://cdn.sqhk.co/detatakev/bZNggMI/word_puzzle_games_that_pay_real_money.pdf
    • http://scarcebook.com/blood_c_season_2_release_dateymgkx.pdf
    • http://uchebnoe.website/nugenevufibupudimezi4mqkz.pdf
    • https://fadufavibog.weebly.com/uploads/1/3/4/8/134889314/899176b2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://9d3edb37-11ce-4d87-b861-4f8d850d55a0.filesusr.com/ugd/0d2aa0_3da2fbbde7dd4ce990a829f837f46df7.pdf?index=true
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_a75596be1fd54d65a9b19e218396b743.pdf?index=true
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_e74131a09fee48be97a9f03fb7d8c82e.pdf?index=true
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_91c77df02cd644a2bb2788b4151e2cf1.pdf?index=true
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_5dd4e05e56e04373b9abfcdbe33bf037.pdf?index=true
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_5fa37d4b1da5455883c93146aa12d8df.pdf?index=true
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_4c9f798afc7441278281117816230037.pdf?index=true
    • https://s3.amazonaws.com/kosipefojaw/fapulafozigaganareka.pdf
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_fc70ea8aa44242029e631f8edff250ba.pdf?index=true
    • https://s3.amazonaws.com/vuxalirudidel/baofeng_dm-_1801_software.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f622.bin
b54c2bb6c59789e2568d2b09bf0b6c3de0daf832d576e932547e02d7f5672457		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 5532 bytes
font_01_sfnt_off000108d8.bin
ee1809b3356f1d6837222a55bda711f30f7680bacf075d3b9ccb95cf175d4755		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108D8 10956 bytes
font_02_sfnt_off00012e28.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E28 4324 bytes

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