Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f49956ca0538d5c…

MALICIOUS

PDF

73.1 KB Created: 2021-02-21 03:21:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6b0fadb6e2414ce40a41f5fc11f56fac SHA-1: 3e7eb5908299caa7cb09c72d0e70984c2b84af52 SHA-256: 1f49956ca0538d5cae8c09e9778746dad7632ab804a16b5deebbeae135401a42
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/123?utm_term=the+hobbit+whole+book+summary PDF link annotation
    • http://1green.space/validity_performance_meaningzxfx3.pdfIn PDF document text
    • https://cdn.sqhk.co/fovipobex/SLheghV/war_of_1812_significance_apush.pdfIn PDF document text
    • https://cdn.sqhk.co/sifolilo/jjhcSji/pressure_washer_surface_cleaner_reviews.pdfIn PDF document text
    • https://vusexojepaxeva.weebly.com/uploads/1/3/4/0/134096357/safakokuvu.pdfIn PDF document text
    • https://wisenuru.weebly.com/uploads/1/3/1/8/131856959/7ad2fe1.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/hgfjfZB/download_rom_toolbox_lite_pro_apk.pdfIn PDF document text
    • https://nasewinadomev.weebly.com/uploads/1/3/4/5/134521200/3451812.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/8521094.pdfIn PDF document text
    • http://erethiztzj.space/76434480040mhq1x.pdfIn PDF document text
    • https://lavabowigu.weebly.com/uploads/1/3/2/6/132682694/118763fa.pdfIn PDF document text
    • https://cdn.sqhk.co/sugezigo/xifAigX/keraxovonawaxeri.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/sukobogixe/god_of_war_3_playstation_game.pdfIn PDF document text
    • http://gasededal.epizy.com/everything_is_illegal_in_california.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/19980545602.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/24998958768.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/caesar_iv_game.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_off0000e0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BB 5272 bytes
SHA-256: 179ce76b04b218f7e3c6cebb3757f044cb8de514f0e6b1783bcc69eef981b2f7
font_01_sfnt_off0000f28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 10836 bytes
SHA-256: d6e82ef305e8de3269fae8dc857e5f506dbce061c72acaaa8a635ea65fcdfa29