Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37efbafc64020ac…

MALICIOUS

PDF

75.5 KB Created: 2021-03-28 14:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 32e3a2ab8177fdc66cc4454fd7bd696a SHA-1: 27f8985b622df4f01d4a616fab514caf80bb0b39 SHA-256: a37efbafc64020acf267856c08797ccbc2eda12d2658d388b7b41b8650d7784f
146 Risk Score

Malware Insights

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

The file is identified as malicious by ML classification and ClamAV, with heuristics indicating it's a link farm and a callback phishing lure. The document body, though truncated, suggests a technical or academic context, likely a deceptive lure. The presence of numerous external URIs, many hosted on disposable domains, further supports the phishing and link-farming nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://druttle.ru/award?keyword=motor+vehicle+dynamics+modeling+and+simulation+pdf PDF link annotation
    • http://lizowaw.scienceontheweb.net/estomago_funcion_y_estructura.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464301/normal_5ffa7e3ad6153.pdfIn PDF document text
    • http://sfr-espace.best/vevethwy5s.pdfIn PDF document text
    • http://ganoget.scienceontheweb.net/32734122331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444123/normal_60264571a3cbc.pdfIn PDF document text
    • http://draiwenstore.online/2-1a_practice_worksheet_conditional_statements_answer_keyz0m5p.pdfIn PDF document text
    • https://jagalanir.weebly.com/uploads/1/3/1/0/131071056/d29323b33654e.pdfIn PDF document text
    • http://memisada.mygamesonline.org/compliance_audit_guidelines.pdfIn PDF document text
    • http://itdomen.fun/charles_capps_mini_bookswejsf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466153/normal_6044763bf1299.pdfIn PDF document text
    • https://zapijuwubasu.weebly.com/uploads/1/3/4/8/134866543/sobepanukakuvob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/282595fe-7b78-483e-942f-21014ee1fd43/attack_on_titan_part_2_end_of_the_world_full_movie_online.pdfIn PDF document text
    • http://saxarivoje.onlinewebshop.net/crock_pot_express_crock_xl_directions.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/how_to_use_kjv_bible_concordance.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/mixuzojupapisogarisela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7396baee-d154-41e1-b439-f44ff6f3cb33/genuduzisokusulimupax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa51c32-1a34-4f61-9e91-f01594fdb4df/the_concept_of_history_of_education_in_nigeria.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/linux_crontab_format_sunday.pdfIn PDF document text
    • https://medlineplus.gov/motorvehiclesafety.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_off0000e8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D9 5736 bytes
SHA-256: 0f4bcf1b07e85f780344e4ec0b4fbb8623531f7baa30fa87b031a3e4382612a6
font_01_sfnt_off0000fc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 10556 bytes
SHA-256: 931cfbd4c871440a69c90b3d0c9f97f2193bd66b6bf6d0d77059ddc28681b1a2

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