Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f2bdb71b72effbb…

MALICIOUS

PDF

82.7 KB Created: 2021-09-22 11:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3a34973f5d902b92628144d73a0e1c09 SHA-1: c2750bab9dab57acf4f2b079328db7c10fa96b14 SHA-256: 1f2bdb71b72effbbd0ccbdff0a44ae7d7489c8d52a629cb4f9ab72cbc4eebd18
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, indicating a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is an SEO manipulation tactic or a distribution point for further malicious content. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence score point towards malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://surestegc.org/documentos/file/24697739833.pdf In PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/58051107496.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c244c3481d---66723753127.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/98236651197.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/wojenasogowozivufopu.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/ludulozugel.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/kajuniroluxaru.pdfIn PDF document text
    • http://gespk.com/userfiles/file/wovenulapajazenupoba.pdfIn PDF document text
    • https://remini.hu/userfiles/file/50943468587.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/gezuw.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/51686131866.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/68250370473.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/44359186633.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/motijives.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/60934216787.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/14807843382.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/jefasav.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/vepewetexifobo.pdfIn PDF document text
    • http://guowangcable.com/d/files/wanezevetanifewuzopetepib.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/25244503705.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/76812167631.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/35051157791.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-16/20210916113352302319.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/daduf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=iphone+12+mini+unofficial+price+in+bangladeshPDF 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_off0000d1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E9 20912 bytes
SHA-256: 0d4389ac690f4359cb745c796c54e446823ff933b727f6b718b8373db9bb1f14
font_02_sfnt_off0001212b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212B 11332 bytes
SHA-256: a2cb243fe7db6644cb2991cc4983fcc4147cd36290dae51b95c4f34d04bf5cbd