Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16ac0acba6f8c5d…

MALICIOUS

PDF

78.4 KB Created: 2021-02-25 12:06:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 1ddb9bb10075819dd275ec90b4a5458a SHA-1: 5aac609830914b661ea6ebb49f72ad13430ff775 SHA-256: c16ac0acba6f8c5dbd4fc3fb38ca0124b64d67bdc3447a0f00291825fa80d3d7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URLs pointing to disposable hosting services, suggesting an attempt to redirect users to malicious content or phishing sites. The document body, though heavily obfuscated, appears to be a lure related to a motorcycle manual.

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://baarspo.ru/strik?utm_term=ktm+990+smr+owners+manual PDF link annotation
    • https://fiwudarive.weebly.com/uploads/1/3/0/7/130775392/jivomilak.pdfIn PDF document text
    • https://pevusipifo.weebly.com/uploads/1/3/4/8/134863194/1807938.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/f6Mjbjc/9569163985.pdfIn PDF document text
    • https://cdn.sqhk.co/pulafefer/deKNcOG/zara_jeans_size_chart_mens.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454999/normal_600452f9dde5f.pdfIn PDF document text
    • http://konsalting.info/foxemuvukocu7r2.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/igpihc4/68323809766.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvezunotumu/dHiaVhf/14556900128.pdfIn PDF document text
    • http://help-nanny.site/pumpkin_carving_festival_near_medlkdm.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/XXigjhU/download_game_alien_zone_plus_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/senaveduwiz/nC8heie/bujabizojijos.pdfIn PDF document text
    • http://alcozerox.com/bapemaluzivz7dpv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405662/normal_5fdf5d23c9a3e.pdfIn PDF document text
    • https://cdn.sqhk.co/zaperarori/icvjigj/2076286953.pdfIn PDF document text
    • https://kevefizi.weebly.com/uploads/1/3/1/8/131871405/f5276d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414331/normal_6011e5319cd47.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vajefam/gndu_date_sheet_ba_3rd_sem_2019.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6C 5192 bytes
SHA-256: f817fe3da75561e0f600c5c2fac9c36c966a1320038648140fce508cee58fba9
font_01_sfnt_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 11228 bytes
SHA-256: a59469de329372b2039fffbae1e2e7a750acef583199e2bedde89e75f7c26c77
font_02_sfnt_off00011775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11775 16144 bytes
SHA-256: 4935603ab55f76872287563a9769dd1c174124dacc281fee03fb2e864e4c444f

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