Malicious PDF — malware analysis report

Static analysis result for SHA-256 157346802fc088a7…

MALICIOUS

PDF

76.9 KB Created: 2021-09-18 14:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 13d074636ad43c2dd8d25f0fa3ed4076 SHA-1: a25c91c62e066824a82f847a4efd0b1e03b7212a SHA-256: 157346802fc088a7ebbaea4136c3ed6b044dfdf6b5279f4588ac358087a81e31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://chip-chup.hu/upload/file/54482890770.pdf In PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/vebenemeboz.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/48236339781.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce2c902e10---33663162667.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/rupujazusevupajivazisike.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/25934836018.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/27429202041.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/zefudaxoxema.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/80773096158.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/kawofizojog.pdfIn PDF document text
    • https://panama4d.com/contents/files/62191056791.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/67948088108.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/zisazoseduvabuw.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210918_173538.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/wikobagoforemenukabatug.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/29956538035.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/5438512202.pdfIn PDF document text
    • http://bienbao.net/uploads/files/fulizajomibakunerume.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/60195515772.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/bexunedusakapenekafofod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+contact+widgetPDF link annotation
    • 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://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_off0000ca07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA07 17092 bytes
SHA-256: 2641f99db669bafe62a1e1cc24dbdc92f212c699d8cfb1ba126dd130855af87d
font_01_sfnt_off0000f684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9B 10400 bytes
SHA-256: 92cf398e448670ea8a43e20d865d51c0507158360ac32c2f489fdaa07c349db9

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