Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6efc304e0c777d4…

MALICIOUS

PDF

73.7 KB Created: 2021-02-08 03:56:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e4770494a8c4ccf3ee3668540ad03fd2 SHA-1: f1b67c70d3830497858e5158068dd175fc959ec4 SHA-256: f6efc304e0c777d4237a4c0f35ee8bfdf7400b9d2b95d4ea2cdf445c2767a446
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links. The document body is heavily obfuscated, but the presence of URLs and the link farm heuristic indicate a likely attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/123?utm_term=billy+taylor+just+friends+pdf PDF link annotation
    • https://mufuwavujove.weebly.com/uploads/1/3/4/0/134042856/6cdb3c17a97acc.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/jdhihbw/jump_force_switch_gamestop.pdfIn PDF document text
    • https://sivaxawisebirim.weebly.com/uploads/1/3/1/4/131407763/zokumesoj.pdfIn PDF document text
    • https://neruwutuwi.weebly.com/uploads/1/3/5/9/135960217/wanugifapipirew.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/hNii2gi/hair_salon_games_hair_styles_and_hairdressers.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/redegelesibif/aquila_report_covenant_college.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/psychology_101_exam_1_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/razob.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/acromegalia_gigantismo.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/sample_argumentative_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/76121739505.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/rirobebaga.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/been_love_memory_plus_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/free_resume_templates_word_with_picture.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/30085286420.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/security_check_icon_vector_free.pdfIn PDF document text
    • http://wosakev.epizy.com/vumusurulapikesuraz.pdfIn PDF document text
    • http://vamagirizotaro.rf.gd/46652641007.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/62323379922.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/authorization_letter_format_for_passport_collection.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_off0000e316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE316 5260 bytes
SHA-256: b28e60170dd5514032c468d5a3fc105471c2e15c4ffbaf6aaa4cf162576b5da9
font_01_sfnt_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 10568 bytes
SHA-256: e47ad76eb92decfa178c426d42421d2e9f8f230f3c99d2984627c7838c8b3e53

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