Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4aa7d2961fe6e4…

MALICIOUS

PDF

81.4 KB Created: 2021-03-01 07:53:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0598793bc535909cb6a2173aadb3600d SHA-1: 476ce7cd9173dbbcb925d706d505a33cd4c16841 SHA-256: da4aa7d2961fe6e49d14d7c5b7da7f29a6b7a0def91582da91de56578aa78a0d
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicative of a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://fokemale.ru/award?keyword=economic+development+class+10+mcq PDF link annotation
    • https://cdn.sqhk.co/tuledapozato/idLgiid/aberdovey_bike_ride_2019_route.pdfIn PDF document text
    • https://cdn.sqhk.co/wukufazujuv/Ftichf6/xifupugi.pdfIn PDF document text
    • https://cdn.sqhk.co/filovixedalu/hjjr1ja/bowigiburabubajemefimat.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/jajb79H/feeling_alone_picture_quotes_tumblr.pdfIn PDF document text
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/furuxobuxazem.pdfIn PDF document text
    • https://cdn.sqhk.co/penazavoxu/adprjfT/ledoroferipixije.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://midiwajuwesi.rf.gd/barons_green_seasoning_recipes.pdfIn PDF document text
    • http://sajetubaj.epizy.com/7196601342.pdfIn PDF document text
    • http://fesenobonirizu.epizy.com/jejovolavemulopit.pdfIn PDF document text
    • http://putiremupupunis.epizy.com/gubulinedikegodig.pdfIn PDF document text
    • http://sikofus.epizy.com/autobots_in_transformers_the_movie_1986.pdfIn PDF document text
    • http://ludesol.rf.gd/71137170239.pdfIn PDF document text
    • http://kagubosewox.epizy.com/tener.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/91240643747.pdfIn PDF document text
    • http://zimifad.epizy.com/xisufatok.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 5248 bytes
SHA-256: 6cd6ee5675e745e058c2e1740f2a4959ef05cc24681eac887fc7f1466716e625
font_01_sfnt_off00010651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10651 10500 bytes
SHA-256: cd242095fb45fd76dd3da369fedf08878770f727ca1b42b223c00cd2a0deb08f
font_02_sfnt_off00012a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A21 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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