Malicious PDF — malware analysis report

Static analysis result for SHA-256 8140702eb2b98e03…

MALICIOUS

PDF

71.7 KB Created: 2020-12-17 16:06:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d072f2f5c1dd05b5b4610590c135edf2 SHA-1: cd7839b49e69a742bac007d59bc73a33f533fb14 SHA-256: 8140702eb2b98e03f872313557da807ea7bb74d1ba5d35683bf32b0d6bfeea19
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, with one pointing to 'trafftec.ru', suggesting a phishing or SEO manipulation attempt. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafftec.ru/wb?keyword=android%20save%20bitmap%20to%20file%20external%20storage PDF link annotation
    • https://jepejopik.weebly.com/uploads/1/3/4/6/134610321/ninokifeberuse_wukewavux_dunudixivug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413000/normal_5f9c1ab0be017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0e844cd1e280355d45049/t/5fcabf606fcc1c6c46150df1/1607122787383/cake_match_3_mania_mod.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4da4c2cf09257bd84ffe6/t/5fc5971cf81c9a2a0c63a40d/1606784797940/dragon_professional_individual_15_german_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7116deddbb05c68931a73/t/5fcb22d936758319a54e044d/1607148258631/57226159120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d490ae7-7d3a-454e-abab-2b80276e4b0c/jupewupapovemufeloj.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e93ce5c7695ca99badce/t/5fcacea89708706f398d9f88/1607126702804/zakurarokoxufinutupokow.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/cervical_cancer_treatment_guidelines_australia.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e552ec917750a3d7e003/t/5fd15538f580b175100241db/1607554362112/gutulidutal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dfd3063-fea1-4d6d-ba02-ce9150c6d1f3/juvadapesawigofesaki.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5443c24b06a7eb31c46ee/t/5fc787afb2fa4660c8d70dbd/1606911920785/71721310289.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/bhoothnath_returns_filmywap.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_off0000d559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD559 5620 bytes
SHA-256: 61d9b2071a1f01c16050fa3c0273f47cb9abe8f54f131c6a2947fc9ae1e3f7d8
font_01_sfnt_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 12392 bytes
SHA-256: 26c17f5d9f586c4fd721382900903cdd63b01bb265eebdc66cf58f33b8455a19

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