Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74a1b1c24437075…

MALICIOUS

PDF

70.7 KB Created: 2021-09-14 12:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 121e565991b969ce1ab914d63e6c7061 SHA-1: f6f38b3a41d3bd7b314f854ee2681cc055ce0fb2 SHA-256: a74a1b1c244370756e2f94ac423fd0089df1e2dc65b4a3e03623e7d20d8aed73
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several pointing to suspicious domains and one specifically flagged as a random URL link. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it acts as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pixomot.ru/uplcv?utm_term=52+inch+china+led+tv+price+in+pakistan PDF link annotation
    • http://ncdesign.it/userfiles/files/97648178075.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/ziwifugifer.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/90726728457.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/84265324855.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe0dbb8bad---mulewawir.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/80532889335.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/63302263145.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/72639674864.pdfIn PDF document text
    • http://innotack.com/userfiles/file/fuxanojevesexub.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/ragonekesufijaxozi.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b594f1f0f---42874494698.pdfIn PDF document text
    • http://generoussecurity.com/uploads/12602700813.pdfIn PDF document text
    • http://vtaky.sk/media/file/33825592287.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/87234732740.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/sojomewegovilipavixasav.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/20925844828.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/xenafakiwonejopatetupepes.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/45367705767.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/9432186772.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/61820327027.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/14/file/20210914_070708_195.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://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_off0000b2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD1 10808 bytes
SHA-256: be5ec6f1467d9f26052aae1b721eea50cb70ff460257f6362c239f74b30732fe
font_02_sfnt_off0000e3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B9 16116 bytes
SHA-256: 7f83b3a6601f6289f142995e955faecba82e2cd54114a9b5817ea522e48e58fa

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