Malicious PDF — malware analysis report

Static analysis result for SHA-256 612e91ed5c1b3204…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 04:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2523a41160a33679fcb8869691485f90 SHA-1: 354073d5932aa2143013c5071b2cb7bb5fdbcfce SHA-256: 612e91ed5c1b3204251154ee6f3522149c4d1e6f2398b38d8d1c56e949afc7ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users, potentially for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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 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://infrive.ru/uplcv?utm_term=firebase+cloud+messaging+java+server+example
    • http://kargo-box.com/uploads/files/65537989978.pdf
    • http://www.deco-interieure.com/userfiles/file/neranadebetomituxopefa.pdf
    • https://dovolena-jiznicechy.cz/uploads/temimumodulid.pdf
    • http://www.jokilaaksonratsastajat.fi/file/kemadotar.pdf
    • https://prawobrzeze.info/userfiles/file/18676034641.pdf
    • http://zentrumok.com/userfile/files/51960110992.pdf
    • http://agnieszkapawlik.com/userfiles/file/31004479687.pdf
    • https://tekmaker.com/upload/files/7005813555.pdf
    • http://www.halpellet.hu/userfiles/files/86477603519.pdf
    • http://groupelamiri.com/uploads/FCK_files/file/36427960810.pdf
    • https://simondaulte.com/ckfinder/userfiles/files/96787697315.pdf
    • http://opusincertum.it/userfiles/files/kinexatu.pdf
    • https://mehreganimaging.com/images/upload/files/rupukadefosoliwata.pdf
    • http://kartinatv.org/uploads/files/70621060700.pdf
    • http://fqcycpa.com/jingkelun/userfiles/files/20210904034942.pdf
    • http://toananhmedical.com/uploads/files/68735352683.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cd967a6c3---93495946594.pdf
    • http://honyi.tw/ckfinder/userfiles/file/gofudagatabu.pdf
    • http://akvatoria.by/UserFiles/files/70257196382.pdf
    • http://dichvugiayphep.biz/upload/ck/files/99671907084.pdf
    • http://asirakademi.com/resimler/files/tavamizopugewudi.pdf
    • http://ozkayalarlojistik.com/userfiles/file/71478163454.pdf
    • https://hoongnau.com/upload/files/pijemaxefibanoduvir.pdf
    • https://telechips.com/ckfinder/userfiles/files/91511945037.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139496ccd1e1---pokug.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://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_off0000d6d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D5 16792 bytes
font_01_sfnt_off0000eeec.bin
8c824dc1b34e21a06f35a02e5f5eb8d371d600a74c3ee2d23c85861016fafe18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 11272 bytes
font_02_sfnt_off000108de.bin
4adea661948e75a16dbd6fb0818316d2bd4e80293cb056344197d2b2857f97b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108DE 18904 bytes

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