Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93dd40cdb79252f…

MALICIOUS

PDF

77.1 KB Created: 2021-05-07 02:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b25e3ad98e063f30aceb71a54fe2c6ff SHA-1: cf128adeef95e59297e1ac3ffae067dd070ec688 SHA-256: c93dd40cdb79252fd69e683dbb65fb4d6f0115f90aa2ee089e1433673f4db4fd
146 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or scam attempt. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or redirection infrastructure. The document body's content, combined with the heuristic 'SE_CALLBACK_LURE', points towards a callback phishing or tech-support scam, where users are prompted to call a number or visit a URL under a false pretext.

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://pelibifir.ru/strik?utm_term=navy+training+base+address PDF link annotation
    • https://cdn.sqhk.co/bapuwanuvadi/jZhejgl/zopagavedarepejepobufukur.pdfIn PDF document text
    • http://penageli.getenjoyment.net/is_there_sequel_to_the_darkest_minds.pdfIn PDF document text
    • http://nomokesus.sportsontheweb.net/borges_y_yo_ap_spanish.pdfIn PDF document text
    • http://xviiivbgz.com/how_to_read_wais-iv_scoresfhs4w.pdfIn PDF document text
    • http://bavomobes.22web.org/epispadias_pediatria.pdfIn PDF document text
    • http://rcasino.info/40235759697yv6ri.pdfIn PDF document text
    • https://cdn.sqhk.co/topedimerab/bicTjfS/associao_de_resistores_exercicios.pdfIn PDF document text
    • https://cdn.sqhk.co/purorenutuw/ejdGHtZ/vetunetidure.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_1129205a6752488da464af5785d1d844.pdf?index=trueIn PDF document text
    • http://bogalibamadom.myartsonline.com/vutujozunumogafaradeban.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4c15d02-0f39-44dd-9358-6cfa5b0a8dbb/97737884303.pdfIn PDF document text
    • http://zoxejotemop.rf.gd/beats_studio_pairing_unsuccessful.pdfIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_b2d430b4ad4148e0a3a91bcaa66c4438.pdf?index=trueIn PDF document text
    • http://jexunon.epizy.com/rumobojosuvaxetese.pdfIn PDF document text
    • http://gugamofizuxeg.epizy.com/zugoj.pdfIn PDF document text
    • http://risuveliki.rf.gd/alpha_beta_pruning_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f060ae95-336e-4501-94bf-c97cb55aeb93/xilojulaforijekulujav.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C2 4908 bytes
SHA-256: ed7bffdab759403120393c6aca6724293cb1bb9dd89ee03914b05e694f7efe4e
font_01_sfnt_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 11220 bytes
SHA-256: 53ee3dcba6ba545340433a542cb06ee5d9e896db03e973cad491dcebae96c3a8
font_02_sfnt_off000117ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AC 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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