Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf935b32565a3179…

MALICIOUS

PDF

77.9 KB Created: 2021-04-18 16:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a01c3391a62ed2b0ae2855ab301cedcd SHA-1: 647dcb2ffacec82b2c2d53e87b8a8751b3466329 SHA-256: bf935b32565a3179618729ec3989f0a76404536295c3cf755746a84f0e302a32
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ClamAV detection and ML classifier also indicate maliciousness, specifically flagging it as a phishing or trojan. While no scripts were explicitly extracted, the nature of the link farm suggests it's intended to redirect users to malicious websites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=which+countries+does+tropic+of+cancer+pass+through PDF link annotation
    • http://topdouche.xyz/dokemepp26oo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465556/normal_5ff38d8d2b9f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454668/normal_5fff03fbea682.pdfIn PDF document text
    • https://silujufadusume.weebly.com/uploads/1/3/1/1/131164496/1971460.pdfIn PDF document text
    • https://bizigixuwufi.weebly.com/uploads/1/3/4/6/134692051/kuzasep.pdfIn PDF document text
    • http://vejuwetuk.mypressonline.com/21363632899.pdfIn PDF document text
    • https://fibepuranes.weebly.com/uploads/1/3/4/0/134041348/a2f6f48a.pdfIn PDF document text
    • https://wovodolu.weebly.com/uploads/1/3/4/8/134861979/nulukevajos.pdfIn PDF document text
    • https://xonasiwebe.weebly.com/uploads/1/3/0/8/130814782/sapomosulik.pdfIn PDF document text
    • http://sevastopol.sale/85798481781n18mc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458390/normal_60590e922c772.pdfIn PDF document text
    • https://zojubexetiw.weebly.com/uploads/1/3/5/3/135316795/4679308cc.pdfIn PDF document text
    • http://goodsun.space/example_of_selective_perception_in_organizational_behaviorvl3gu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443357/normal_604222d7abae1.pdfIn PDF document text
    • http://top-odejda.com/glencoe_algebra_2_standardized_test_practice_answersyy790.pdfIn PDF document text
    • http://insurancesouk.com/47777140886l2uwe.pdfIn PDF document text
    • https://viwefinorix.weebly.com/uploads/1/3/0/8/130813514/menizofulilov-zapifik-nudedaduna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410703/normal_605849e91d030.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/3338906372.pdfIn PDF document text
    • http://nedizilunok.myartsonline.com/flagellar_movement.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/ziduvegebunawo.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/vesifoj.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 5396 bytes
SHA-256: e2914d9161cab7fd2ca47738209a5aeeff0dc3f514304d1a6dc713bd930ed3b5
font_01_sfnt_off00010585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10585 10820 bytes
SHA-256: b5814b470fd27b326a5885b35b3f34daf7532d3399bbab9564ae0fe082d3dc45