Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3ac5f00903995e…

MALICIOUS

PDF

76.3 KB Created: 2021-01-24 05:19:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f2c50be4ded3404b4ede974eda3163dd SHA-1: f41b8931c664b6dab9d3cf8892f39708e9603047 SHA-256: cd3ac5f00903995ef23985bb955fe7d03519e6dfa46e0890f76754ab32ac94f7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, indicating a link farm or redirection mechanism designed to lead users to malicious sites. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafffe.ru/123?utm_term=neutron+activation+analysis+principle PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475209/normal_600414c199f4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482617/normal_5fe11715c04f9.pdfIn PDF document text
    • https://tujupanex.weebly.com/uploads/1/3/5/3/135333196/533b1.pdfIn PDF document text
    • https://tadirexexex.weebly.com/uploads/1/3/2/6/132695418/1282756.pdfIn PDF document text
    • https://gixujadimi.weebly.com/uploads/1/3/4/7/134708567/kugol.pdfIn PDF document text
    • https://diwosilanula.weebly.com/uploads/1/3/4/7/134765308/1c001521b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445531/normal_5ffc116f57744.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386848/normal_5fe401519aa51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/20657270960.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/basic_immunology_mcqs_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/47094422386.pdfIn PDF document text
    • http://vugapadilubokis.epizy.com/91371288877.pdfIn PDF document text
    • http://sidegiri.epizy.com/crisis_addisoniana_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/arabic_fast_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/everglow_bon_bon_chocolat_song.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_off0000eedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDD 5060 bytes
SHA-256: e4d857e1db6f1ef8eff28b06bdf2465c3a9974a965527d4f7c88c948026a88d6
font_01_sfnt_off00010034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10034 10444 bytes
SHA-256: 4f8c53c0045c28edf44d0a3d0eebfd1a13dc23f6b042b8fa35a19b0b4c07f578

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