Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8b36e0a89d0299…

MALICIOUS

PDF

75.8 KB Created: 2021-06-05 16:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2915df0b68577b55330a46c75c2894a6 SHA-1: 340942545a73d5e57bc58481984be5d3d298bd2c SHA-256: 6e8b36e0a89d02990719714c5d2a650ef94080521bb4fdb933b9dc1ad85cd2bd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of external links, flagged by heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The document body is heavily corrupted, preventing analysis of its specific content, but the link farm structure is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/123?utm_term=mono+red+sideboard+guide+standard PDF link annotation
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/likil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384150/normal_6016ddc95da94.pdfIn PDF document text
    • https://febelozo.weebly.com/uploads/1/3/4/5/134599394/zibuwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_6069490e4aceb.pdfIn PDF document text
    • https://kaxesudinebeg.weebly.com/uploads/1/3/1/3/131379803/witivaguguzibajasu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451228/normal_60664613e6225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_60175f6ecc90b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455657/normal_5ffc1d03798f6.pdfIn PDF document text
    • https://fikazimibugexu.weebly.com/uploads/1/3/4/5/134515259/timaloje_wizidibisoka_tulur_zokapenikofexin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455916/normal_5fd79579dda10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403541/normal_606aaace7b4d5.pdfIn PDF document text
    • https://bipalokepug.weebly.com/uploads/1/3/4/4/134492575/vevufofakamag-wabulokom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500911/normal_5ff60427dd7fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fokojifidesi.pbworks.com/w/file/fetch/144514545/89961779865.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/bally_5000_plus_slot_machine_manual.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144571812/vutipofodemituruzuzu.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/47532477010.pdfIn PDF document text
    • http://movovepavuzi.pbworks.com/w/file/fetch/144666189/digitech_whammy_v4_power_supply.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144423987/albert_camus_veba_zeti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b2865b6-c5be-440f-9501-bd70c941f993/jususapufiruvujijowajazil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8afe3cda-ac30-4624-b5ba-412112158fd2/si_plus_que_parfait_conditionnel_passe_exercices.pdfIn PDF document text
    • http://nigezid.pbworks.com/f/jivomirex.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_off0000eb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 5108 bytes
SHA-256: adb9e200c1e8481db24c4827a3c529b66c60e77f4082f057ac72588573a8de06
font_01_sfnt_off0000fd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD07 10424 bytes
SHA-256: 031b11aefc4d6806559d60c8e20e22236ef0b3a518a0fe4a5cc53de2fd5e22bb