Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b41f7a66d98f8f9…

MALICIOUS

PDF

85.2 KB Created: 2021-05-18 23:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c0cafe5f7a0b5c91cd6b8da15943c912 SHA-1: 9209a229d224d83585d5e2ca2256be13836f56c0 SHA-256: 2b41f7a66d98f8f926c6d41255251be2dc1318db4c97aead874bd4211d85b4bd
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the nature of the link farm are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://xajibur.ru/strik?utm_term=iron+man+2+movie+script PDF link annotation
    • https://xatoxelal.weebly.com/uploads/1/3/1/4/131482937/1318613.pdfIn PDF document text
    • https://wimugedi.weebly.com/uploads/1/3/4/7/134725841/1428c192133d3.pdfIn PDF document text
    • https://vuligezu.weebly.com/uploads/1/3/5/3/135391643/wugedokebivi_sedapo.pdfIn PDF document text
    • https://labifunuvi.weebly.com/uploads/1/3/4/8/134847398/vakakapoperufijanup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445325/normal_606e6f71848af.pdfIn PDF document text
    • https://zoxexakaxikat.weebly.com/uploads/1/3/0/7/130739387/memagulori.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365602/normal_5fdeea6b69c71.pdfIn PDF document text
    • https://mosuvixixe.weebly.com/uploads/1/3/0/9/130969854/pofegunujewu.pdfIn PDF document text
    • https://gipumoku.weebly.com/uploads/1/3/4/7/134710759/repebarojaxejoxes.pdfIn PDF document text
    • https://dowozazufexu.weebly.com/uploads/1/3/4/6/134606261/ea6dc3d964.pdfIn PDF document text
    • https://befejabenitegi.weebly.com/uploads/1/3/4/5/134530095/wazelebukezepexuk.pdfIn PDF document text
    • https://tawugeri.weebly.com/uploads/1/3/4/7/134774142/xozusu-rosemiwiwawavit-jopuxaxidif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a4cf4ade-5faa-4614-a496-a6f8934c8230/19616974465.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/85088248615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37194b31-24c0-4896-8441-e5791e095542/ms_excel_formulas_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/diary_of_a_wimpy_kid_cast_dog_days.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3d44215-5447-4491-90e5-d0c27f471ebc/how_to_do_easy_origami_bird.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17147a8c-a1aa-483d-aeb4-a2ca0d057f5c/motevuvinakani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a473306-137d-4db5-970f-2f9d3845018c/bafavopuxukimugidas.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/43631142895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77e29f3e-4410-4b3d-b0f6-5bc9ea93fefb/70095497435.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/garusibevinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74b2b666-a3fd-4965-aeba-b245f9d61a7e/9216951998.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 4964 bytes
SHA-256: d970e16782145e1ef7080c327ffac5ce7fac7a27c49096e006235a56d5cecf1a
font_01_sfnt_off000114ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AE 11016 bytes
SHA-256: f977cff75ec98d20223c3683862ad6f5f2486969de79d55561844e6cdae6e2b7
font_02_sfnt_off00013991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13991 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378