Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c7bf79c983e10f…

MALICIOUS

PDF

72.7 KB Created: 2021-02-18 23:02:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c7954d3f10ab2bd640f69afc96d0eada SHA-1: 0fda6e24694e284167a4139b297b26ea5e3ec9e6 SHA-256: 42c7bf79c983e10f70906cbb2b55cb1e7daff68b98693170583c8ccee7ff0798
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing lure. The 'SE_MFA_LURE' heuristic specifically suggests a credential harvesting attempt, likely by directing users to fake login pages. ClamAV detection and ML classification further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://baarspo.ru/aws?utm_term=q+see+4+channel+dvr+default+password PDF link annotation
    • https://cdn.sqhk.co/zifiguwosu/voghZSQ/snake_identification_houston_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/pesegozod/ihabVgh/52076426006.pdfIn PDF document text
    • https://xorigikaku.weebly.com/uploads/1/3/1/1/131164164/3912664.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/ggeLjg2/real_3d_racing_games.pdfIn PDF document text
    • https://cdn.sqhk.co/tikalamin/x77tHgg/pixel_sniper_zombie.pdfIn PDF document text
    • https://cdn.sqhk.co/wofetewa/b57zjWR/66805888492.pdfIn PDF document text
    • http://mainsale.info/participle_and_participial_phrases_worksheet_answersuqybe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471703/normal_6025cbe9b44b0.pdfIn PDF document text
    • https://waneratamif.weebly.com/uploads/1/3/1/4/131436972/5423992.pdfIn PDF document text
    • http://martans.space/investigacion_cualitativa_sampierizt9af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497344/normal_5fd6ea80b0518.pdfIn PDF document text
    • https://porovepo.weebly.com/uploads/1/3/4/5/134527374/sopiridubutozuvuvure.pdfIn PDF document text
    • http://neo-tp.ru/insanity_max_30_workout_calendarz429j.pdfIn PDF document text
    • http://pimuxiv.22web.org/which_bone_forms_by_intramembranous_ossification.pdfIn PDF document text
    • https://cdn.sqhk.co/zekafomaze/cghQNmB/difovozoz.pdfIn PDF document text
    • https://mozepuboxiwagu.weebly.com/uploads/1/3/6/0/136094106/39531.pdfIn PDF document text
    • http://merutakozuxonu.22web.org/tinkerbell_coloring_pages.pdfIn PDF document text
    • https://cdn.sqhk.co/jimikafede/aicifha/moserezanezadiw.pdfIn PDF document text
    • http://tevuvisena.iblogger.org/intravascular_catheter_related_infections_guidelines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kafopazam.epizy.com/excel_macro_activesheet._paste_values.pdfIn PDF document text
    • http://mukowepefirufeg.epizy.com/19167402832.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_off0000dddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDB 5544 bytes
SHA-256: 335505d9ae59551a7fd4172caac1185beb9229b18af745b3329afee7983c1e79
font_01_sfnt_off0000f0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D3 10808 bytes
SHA-256: e72510b69ee2921982b580446df8823b425c66977d2254f5c5600ff01ac25bf0

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