Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c134857f1eea2b…

MALICIOUS

PDF

67.9 KB Created: 2021-02-22 14:39:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f36eb2f0e4ae41887f209f9f7a4ed2b8 SHA-1: b2976f78b8b5013fb9d46018f862e5ccde86546d SHA-256: 12c134857f1eea2b10a9459966c0c47811d7cc956273c812dd047f345ac67dd6
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The primary URL appears to be a lure related to appliance installation, likely a pretext for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wb?keyword=how%20to%20install%20ge%20dishwasher%20kick%20plate PDF link annotation
    • http://virepidutajal.iblogger.org/rizarex.pdfIn PDF document text
    • https://pigumetazemebet.weebly.com/uploads/1/3/0/7/130775485/famoso.pdfIn PDF document text
    • https://zevijilutijeso.weebly.com/uploads/1/3/4/8/134850931/ruvizolanuput.pdfIn PDF document text
    • http://badgesverified.com/essentials_of_geographic_information_systems_version_2.16otz8.pdfIn PDF document text
    • https://jozurukezareta.weebly.com/uploads/1/3/4/7/134741488/88d8161db9a7.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/zezopemiloteru.pdfIn PDF document text
    • https://vupixesit.weebly.com/uploads/1/3/2/7/132740805/pinov.pdfIn PDF document text
    • https://tenubufaz.weebly.com/uploads/1/3/1/1/131164261/2000675.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzagile/7qbOhhO/70102861432.pdfIn PDF document text
    • https://cdn.sqhk.co/narulaloro/QajigfL/kigulawogakip.pdfIn PDF document text
    • https://kajubogoxin.weebly.com/uploads/1/3/0/9/130969430/1092686.pdfIn PDF document text
    • http://salonapp.xyz/find_the_missing_exterior_angle_of_a_polygon_worksheetexbvw.pdfIn PDF document text
    • https://gujinaberukigav.weebly.com/uploads/1/3/1/8/131856979/tuwefij_bedapexunir_savagine.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/jgXjekZ/wutozatuwidiroj.pdfIn PDF document text
    • https://lugukeku.weebly.com/uploads/1/3/1/4/131407734/fasamekija.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://patabajisof.epizy.com/o_que_balance_sheet_em_portugues.pdfIn PDF document text
    • http://putesedesupelo.epizy.com/49336859753.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_off0000cc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3D 5452 bytes
SHA-256: de2ed23d9c58c20118a03179f2bb06ba4b99ebb013c872830e9c1abf21f7f2d8
font_01_sfnt_off0000ded0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED0 10396 bytes
SHA-256: 30cdb07e3e734280d60f949f4f76e9bfe49a3d0e31c853153a75638d268923b2

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