Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8bdb2fdddbca39…

MALICIOUS

PDF

81.3 KB Created: 2021-03-24 08:51:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 14178ae071e891da10c4b9c4536190ec SHA-1: cac230e4122cca874a3604296d2fa39ce5d05b29 SHA-256: 9a8bdb2fdddbca3905e047435242752d2bd02a6e783a608925c484f54edee676
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicating a link farm or redirection service. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. ClamAV also detected it as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the structure and numerous URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://dugedepap.ru/123?utm_term=free+calligraphy+alphabet+template PDF link annotation
    • http://wedipum.mygamesonline.org/tubelofokal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489615/normal_60109ab97b8ff.pdfIn PDF document text
    • http://nazorizuz.medianewsonline.com/gexepolanurewaledowe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462352/normal_602ae26a6ce9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417039/normal_602954645337e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371261/normal_604b613219789.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486975/normal_603801dfa8d62.pdfIn PDF document text
    • http://xonitaj.mywebcommunity.org/fanararomotu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462379/normal_5fe6bf0ab44f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414849/normal_5fd0816178d1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378406/normal_6007b67e740b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://16cc4848-9a85-487f-bc1d-da55f68f8448.filesusr.com/ugd/dcf86b_88405434807f47bba012a911b673bd88.pdf?index=trueIn PDF document text
    • http://legokejapo.atwebpages.com/best_clinical_pharmacology_book.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/chrono_trigger_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/tefulanuzogapono.pdfIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_b577af0cae71455584fc73dd79875006.pdf?index=trueIn 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_off0000eb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0B 5368 bytes
SHA-256: 32727fac0d31cef64f9ebcaa79c38f12221180055b24495d7e53a3e3e66153f8
font_01_sfnt_off0000fd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2D 10860 bytes
SHA-256: cd919b3f3283e89f6a9b26b73b5ff49e9289f5975c330e1b9116b8fb7d80b94a
font_02_sfnt_off00012259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12259 16192 bytes
SHA-256: 75499cce6ae774eb1ed11ef55a8e4af94387e50334f2f733f224f7d1a8712777

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