Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c77970e13b80905…

MALICIOUS

PDF

70.2 KB Created: 2021-02-23 12:47:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 372cc9bb92e371b5658153fb9aebc741 SHA-1: 6d75c72fdf691318e135be2b8c5be6c505be868c SHA-256: 5c77970e13b809054dbb1367c7a208fbe16590e4a730a0122371c90935a757fb
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It employs a link farm strategy with multiple disposable domains and SEO-optimized URLs to lure victims. The embedded URL `https://bologen.ru/123?utm_term=percy+jackson+1st+book+pdf+free+download` suggests a lure for free content, a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://bologen.ru/123?utm_term=percy+jackson+1st+book+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464053/normal_5fe8832140ecf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452845/normal_60158a7df0275.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_6015ee9eb9b48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459623/normal_5febea96f01ff.pdfIn PDF document text
    • https://cdn.sqhk.co/zomuzesirira/gMjgmhd/41111013442.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/ihajd7K/dj_mixing_song_download_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456666/normal_5fe9213a3f2f0.pdfIn PDF document text
    • http://xupenirulavep.iblogger.org/lofinipiwowupak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459328/normal_602a06d817b59.pdfIn PDF document text
    • http://maxapur.22web.org/talupumapulupavaroripi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417543/normal_5fc5f70a74663.pdfIn PDF document text
    • https://cdn.sqhk.co/xadowififux/ajaGJrt/64989695859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416789/normal_602add63d69c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xokeraje.rf.gd/brunswick_ohio_police_accident_reports.pdfIn PDF document text
    • http://bupujipa.epizy.com/multiplying_exponents_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/renusanaxulebagoju.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/33042707644.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/uda_tecnologia_e_informatica_scuola_primaria.pdfIn PDF document text
    • http://suzitemilivofer.epizy.com/vopezogaxagozebolenojili.pdfIn PDF document text
    • http://kirimogopagi.rf.gd/29529248164.pdfIn PDF document text
    • http://mabazekow.epizy.com/4060633844.pdfIn PDF document text
    • http://wozalomar.rf.gd/segenizezegu.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_off0000d2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B5 5676 bytes
SHA-256: 85a78c5e05e2a389ab12842045ff75e5cda94ad64a99722dd9a061058880bddf
font_01_sfnt_off0000e638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE638 10844 bytes
SHA-256: b4d324125851f9a90007317dd66d378738544683d6d6e5155989289859630027

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