Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb74f3eccf1765f9…

MALICIOUS

PDF

79.2 KB Created: 2021-05-08 05:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: db9ea534d06fa1ec2de3062cf2d6c484 SHA-1: d4c6d82613082a7221c9fb84ea08150f673ce8a6 SHA-256: fb74f3eccf1765f9bf0ada3ed55a942c2e7f309b35ea49a58dac87cf3f5fc68b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://xajibur.ru/strik?utm_term=how+to+crochet+a+hat+step+by+step+with+pictures PDF link annotation
    • https://cdn.sqhk.co/wuzirixowev/hfhajd4/most_fast_bowler_in_cricket_history.pdfIn PDF document text
    • http://lonotel.mygamesonline.org/biasing_of_jfet.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/KLAjiRU/personal_safety_equipment_cleaning_pads_alcohol-_free.pdfIn PDF document text
    • http://gafuvufafokujop.sportsontheweb.net/pobawatuwek.pdfIn PDF document text
    • http://kittyplay.online/767640811skmih.pdfIn PDF document text
    • http://nulepunu.22web.org/3361025995.pdfIn PDF document text
    • https://mimasalidapu.weebly.com/uploads/1/3/4/4/134466186/6182033.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/capacity_management_itil_v3.pdfIn PDF document text
    • https://xexabusaxokazo.weebly.com/uploads/1/3/4/4/134478329/483717c04f1aa.pdfIn PDF document text
    • http://dekovag.mypressonline.com/bhagat_singh_biography_in_english.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/71440939608.pdfIn PDF document text
    • https://zelekunidos.weebly.com/uploads/1/3/2/6/132682808/9f0e74.pdfIn PDF document text
    • http://lakcherie.ru/powiwexobu9tewz.pdfIn PDF document text
    • http://predouche.xyz/galebob0sq89.pdfIn PDF document text
    • http://gebevojika.mygamesonline.org/confirmation_bias_psychology.pdfIn PDF document text
    • http://zomolejefej.mywebcommunity.org/balderdash_instructions.pdfIn PDF document text
    • http://uspex22.online/55309633120lrj96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kalotiwinilobiw.epizy.com/99636228227.pdfIn PDF document text
    • http://nibizuladode.onlinewebshop.net/81848452892.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_off0000f61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61F 5284 bytes
SHA-256: a659c5d7bdb24623e0665a2acf8f7d83639583e53ef14fd1e27d1c2131cfeb1f
font_01_sfnt_off00010823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 11484 bytes
SHA-256: 45f29111f6fc14236d94855d6b1d78ce1c953249e33780c56a0a335bcd0cd984