Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c84aa8d0b62dee…

MALICIOUS

PDF

73.4 KB Created: 2021-02-20 04:56:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 6260b7fdbaf77ae658759f2a4c4e7ee8 SHA-1: 39c5d671da8a391b6d8aa93201c38044ff38faee SHA-256: c8c84aa8d0b62deeca9d2cd749dee7390b39b9e7eb63dc6b71f69ce2cbaa8b53
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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 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.
  • 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.
  • 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://jacksth.ru/strik?utm_term=how+to+use+midi+controller+ableton PDF link annotation
    • https://vozutadisifik.weebly.com/uploads/1/3/1/4/131483249/pabufifafek.pdfIn PDF document text
    • https://tenanetudoji.weebly.com/uploads/1/3/4/2/134266315/sasuteti_vukeva.pdfIn PDF document text
    • https://cdn.sqhk.co/lixozimiz/Y0iKjeS/25169550668.pdfIn PDF document text
    • http://groshyk.site/best_tuner_pedal_for_intonation1yx5a.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/gfOdgcb/bobagesuzezelesekoxu.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/j9HjcTr/hopper_app_android.pdfIn PDF document text
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/sojezudozenenoga.pdfIn PDF document text
    • https://nadagedo.weebly.com/uploads/1/3/1/8/131858166/1051668.pdfIn PDF document text
    • https://rakevuxex.weebly.com/uploads/1/3/4/0/134040666/498b1b6cae39844.pdfIn PDF document text
    • https://pizijejubuga.weebly.com/uploads/1/3/4/8/134883891/ebd6e954d7e5dd1.pdfIn PDF document text
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/dizijavisupuvama.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/jfqhfbV/zombie_hunter_survivors_fighting_hack_apk.pdfIn PDF document text
    • https://lugoponogib.weebly.com/uploads/1/3/4/4/134404253/90bb8d5.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/jTpbphc/ringtone_maker_apk.pdfIn PDF document text
    • http://coolstudent.space/bahubali_movie_free_teluguge5qy.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/sixenogafopoj/electricity_and_magnetism_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/hello_there_sound_effect.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/infuriating_crossword_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/fusitapomuvapinoxo.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_off0000e1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DA 5276 bytes
SHA-256: c4a0ab543692ac1789e2b2115c586f925f01fb7f98080218bb226e7fbb551eed
font_01_sfnt_off0000f3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BA 10852 bytes
SHA-256: cfc6a00e5103c855e7509cbdb868e8c6f4fbc6338641df75975997d85bcb611d

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