Malicious PDF — malware analysis report

Static analysis result for SHA-256 7736b4626ad35ea7…

MALICIOUS

PDF

77.8 KB Created: 2021-04-06 14:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: aabe2a02c7d52bcc4d7520699f48de2b SHA-1: 2f5dc85c5995d19223c607d75db5626be05b4d00 SHA-256: 7736b4626ad35ea746fea3f1ce795e25acc8d206373df8a920e7c7b7401f0b53
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. It contains numerous external URIs, with one prominent URL being https://pelibifir.ru/strik?utm_term=why+does+my+compressor+not+build+up+pressure, suggesting it's designed to redirect users to a potentially harmful site. The PDF also exhibits characteristics of a link farm on disposable hosting, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://pelibifir.ru/strik?utm_term=why+does+my+compressor+not+build+up+pressure PDF link annotation
    • https://cdn.sqhk.co/lajojeletab/ieiehaD/transition_words_worksheet_high_school.pdfIn PDF document text
    • https://cdn.sqhk.co/muzolorakow/tjcjdgd/cyberfoot_2020_apk_mod.pdfIn PDF document text
    • https://kelasevu.weebly.com/uploads/1/3/4/6/134697592/jibetitaxegi_lakafovi_diwek_zosogukagel.pdfIn PDF document text
    • https://ribarifi.weebly.com/uploads/1/3/4/2/134266405/abe8be.pdfIn PDF document text
    • http://deromgroup.com/sat_test_datesbs6wj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445879/normal_5fcbe4cf6a7db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447487/normal_603c53f2a3580.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378406/normal_5ff80674bff77.pdfIn PDF document text
    • http://checkmycredit.info/16375397002r8lpi.pdfIn PDF document text
    • https://jurivulanikep.weebly.com/uploads/1/3/4/5/134525456/limilowuvojola.pdfIn PDF document text
    • http://skidki-day.shop/buduwueyo2v.pdfIn PDF document text
    • http://temppicture.xyz/juwaxajilugevor9geb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407998/normal_5fec3223e2acf.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/cibEJcn/zara_online_shopping_uk_sale.pdfIn PDF document text
    • http://kaxavetaxudu.mywebcommunity.org/sentence_according_to_structure.pdfIn PDF document text
    • https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/4342076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377647/normal_605f456481c0a.pdfIn PDF document text
    • http://iglivesupportteam.com/the_pact_documentary_netflix_hitlerx2l16.pdfIn PDF document text
    • https://cdn.sqhk.co/posibovifiw/eyKhdhi/xunukewuzarijuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sajatuvireguta.atwebpages.com/tutorialspoint_data_structures_and_algorithms.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/maya_angelou_biography_for_kids.pdfIn PDF document text
    • http://naxesabefadufu.atwebpages.com/clasificar_numeros_racionales_e_irracionales_ejercicios.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_off0000f367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF367 5360 bytes
SHA-256: ab83510ac5e004c51b07c856c19f04e28df344a8d2fe2cdfcbde4d5685cf55b1
font_01_sfnt_off00010584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10584 10532 bytes
SHA-256: 69c98d91a857a87a346a243c5a0a3ace4cd0e5a102f557e6fadee88ae5e76d34

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