Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f14136bf82e2879…

MALICIOUS

PDF

74.2 KB Created: 2021-02-05 02:28:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fb59511bbe984137b9c165e8703c5557 SHA-1: f94b39899435d4c36b2537f1dc29e7b0089e0bfe SHA-256: 4f14136bf82e2879ade010301869acd5f4ffebc7a1111eb41cc3894bcf852a2a
126 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'bologen.ru' with a keyword search, and another to a link farm on '0fruits.space', suggesting it's designed to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

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://bologen.ru/wb?keyword=meditations%20in%20an%20emergency%20book%20pdf PDF link annotation
    • http://0fruits.space/levigozaluvujanisugizokaz1ov3g.pdfIn PDF document text
    • http://pochta-24.cc/new_york_city_jumper_river_island4vhn9.pdfIn PDF document text
    • http://urro-hu.com/sazuxokunode6735p.pdfIn PDF document text
    • http://ig-mediateam.net/sfm_adult_modelsbj34j.pdfIn PDF document text
    • http://constructionhouse.info/nexubobatepw5buu.pdfIn PDF document text
    • http://amorexpo.com/wow_bfa_feral_druid_pvp_rotationx4e45.pdfIn PDF document text
    • http://nudistoff.club/futeridurado4dj8.pdfIn PDF document text
    • http://iclod.tech/english_9_task_10_delving_deeper_answerh02cs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492586/normal_5fc63cb46bfef.pdfIn PDF document text
    • http://5gusevshop.space/66421940804sb3kn.pdfIn PDF document text
    • https://banukusisazej.weebly.com/uploads/1/3/4/8/134893357/5286ce894ac0c50.pdfIn PDF document text
    • http://mavitrade.com/dazutugewekumudafpvrf1.pdfIn PDF document text
    • http://bestita.space/2705190313ien30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379613/normal_5fd1f6bd27d05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487623/normal_5fe15171466ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://baverasoge.epizy.com/free_machine_embroidery_fonts._pes_format.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_off0000e386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE386 5756 bytes
SHA-256: d3becb99e1a59c4f5814984dd96f4cfa352620e6d769b82ea0115d3eca056572
font_01_sfnt_off0000f71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71F 10752 bytes
SHA-256: fef2b91c703f95ba4305ea262bf4d7dd601c35ba55be356ad31d086065aa4cd6

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