Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb0f1353b3af8a8…

MALICIOUS

PDF

73.6 KB Created: 2021-03-16 10:47:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9268dfea845844646ed8a9c5b5229b75 SHA-1: b9c0c7d467680e1d7b18078f783926047a9a1d86 SHA-256: ddb0f1353b3af8a85e3e325ceb53bb7afcd0f1c2f8d7b9c06a7bf24c3e3ee223
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/123?utm_term=blends+worksheets+for+kindergarten PDF link annotation
    • http://soxetav.iblogger.org/kirobi.pdfIn PDF document text
    • https://nogenovone.weebly.com/uploads/1/3/4/7/134745979/0c14245e776c00e.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/jexexijepunib.pdfIn PDF document text
    • https://cdn.sqhk.co/puwupasakej/giewueb/management_consulting_salary_mckinsey.pdfIn PDF document text
    • https://cdn.sqhk.co/pewesopefim/iic0gcR/avatar_maker_cats_2.pdfIn PDF document text
    • https://xoselupovogim.weebly.com/uploads/1/3/4/6/134610719/gekimidi-fasamiza.pdfIn PDF document text
    • http://pidikugojan.22web.org/the_first_estate_was_made_up_of_frances_nobility.pdfIn PDF document text
    • https://rurikuzusobow.weebly.com/uploads/1/3/4/8/134879219/xilod.pdfIn PDF document text
    • http://ranebixulukaku.iblogger.org/jikuzizenasoveju.pdfIn PDF document text
    • https://gazotudigexeb.weebly.com/uploads/1/3/1/1/131164446/5919385.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_459b11c963f84a6bb6961859ed283eef.pdf?index=trueIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_3046600d3d354463819bacf7ca1353a7.pdf?index=trueIn PDF document text
    • http://zarazemudaseri.epizy.com/youth_lacrosse_stick_sizing_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3cfc013-64ae-4459-acdc-3d06df87aa41/what_jojo_characters_are_in_jump_force.pdfIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_cd5133da6e0e4ced85059cfb87e4dff5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c9afc21-5afc-4a5b-8ed8-ce18f653064b/craftsman_self_propelled_lawn_mower_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2d9a14e-8816-4575-a350-9604f987e7d7/70557526937.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_d224420205cc468c98553ce4abf9f443.pdf?index=trueIn PDF document text
    • http://gazezubutajon.rf.gd/are_there_eggs_in_nabisco_graham_crackers.pdfIn PDF document text
    • https://82656f1f-dd0f-4426-89ca-c5688288f975.filesusr.com/ugd/56de54_3f28b10b4637439898655981889951d5.pdf?index=trueIn PDF document text
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_d61845db66064029b9369e8dc517e6c2.pdf?index=trueIn 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_off0000e0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 5376 bytes
SHA-256: 8d6ec2253ddbe7c38b7944212ad0dc2a3e44f42e90da52b9a7cfaa3f7292025e
font_01_sfnt_off0000f348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF348 11112 bytes
SHA-256: 8f5f8445358c3953a727a4e4c39f4e8d2e7874e469d654975cd0340c4bd0d2b3