Malicious PDF — malware analysis report

Static analysis result for SHA-256 35912976c5baf9dc…

MALICIOUS

PDF

72.3 KB Created: 2021-02-25 17:51:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9bbde1736384d6e171ac5f444442f125 SHA-1: 4d6877c4b49b6002f28e9e0476b76315821748bd SHA-256: 35912976c5baf9dcca4d9f0080d9615bc56c84b4fd36275e1205b2e0986c719d
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains or subdomains, suggesting a link farm or SEO abuse tactic. The embedded content, though heavily obfuscated, appears to be a lure related to 'dyson black friday sales'. The presence of multiple external URIs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to phishing or scam pages.

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://maypoin.ru/wb?keyword=is%20dyson%20having%20black%20friday%20sales PDF link annotation
    • https://cdn.sqhk.co/duzoxibuf/icieJNe/soxarifironodigape.pdfIn PDF document text
    • http://grizhoff.ru/benakazakewjnd0p.pdfIn PDF document text
    • https://tazapupexon.weebly.com/uploads/1/3/4/6/134634001/lojim.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/what_is_a_business_case_summary.pdfIn PDF document text
    • https://xilarurizajefa.weebly.com/uploads/1/3/5/3/135347329/vagigesaf-negizojofe-sadinefidotix.pdfIn PDF document text
    • http://gidpopiteru.com/tecnicas_de_aprendizaje_colaborativoszp1h.pdfIn PDF document text
    • https://cdn.sqhk.co/rosojolude/i36igZ5/radio_commander_cheats_active.pdfIn PDF document text
    • https://cdn.sqhk.co/pifixijowoka/cFicjbe/75285345100.pdfIn PDF document text
    • http://timelessdecorum.com/8601629972n564v.pdfIn PDF document text
    • https://gawowulovo.weebly.com/uploads/1/3/5/9/135966180/xapaturaka-mitunetebevupa-zixelagitowaxol-nuwoxa.pdfIn PDF document text
    • https://cdn.sqhk.co/dipewoduge/c3ggShc/music_tiles_3_songs.pdfIn PDF document text
    • https://xokotenesuku.weebly.com/uploads/1/3/1/4/131438709/rebofakil_lodolafukusi.pdfIn PDF document text
    • http://gakmancreatures.ru/81996252686jcn42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000db84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB84 5584 bytes
SHA-256: f25ada50adc9ed660e928384a38f9ec0ddcc03e70e8806d38b9609eefdb0a9c9
font_01_sfnt_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 11236 bytes
SHA-256: a8d95476f4e37273dec731cc6340feaf9cd068081364da00f6bdb7e7d21b654d

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