Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a99609a43dbffb…

MALICIOUS

PDF

87.2 KB Created: 2021-06-13 01:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 96147d807b67cf9b0a43da4349e74bba SHA-1: 8170eb6a274e3954932e8d8eff355c7c3bc80595 SHA-256: b6a99609a43dbffb430a8cd895480eae6a34998a9a0c531aece2530fad8aebdb
186 Risk Score

Malware Insights

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

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 0.9995

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://oniceh.ru/pbw?utm_term=aaron+smith+dancin+krono+remix+mp3+download+320kbps PDF link annotation
    • https://fulimutalez.weebly.com/uploads/1/3/4/5/134599943/wawuxavu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417024/normal_60483e42ec757.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447253/normal_60012f6a9059c.pdfIn PDF document text
    • https://soxobepasi.weebly.com/uploads/1/3/4/6/134677568/rasedet-dudexijoxovo-pufoguza-jijiku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375088/normal_60517b0c23cc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368998/normal_602d1fba1c87c.pdfIn PDF document text
    • https://kulaxewanugig.weebly.com/uploads/1/3/1/3/131384484/881dd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_605fb440865b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386837/normal_5fe3d6631a3a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446165/normal_600f1cbd0f0d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/25efa635-cb91-417c-b5fc-89fd756ad3d4/34887590913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2904f85-7b40-49b6-b747-2ca0142f8326/suzupozipofegawabe.pdfIn PDF document text
    • http://juboxeraris.pbworks.com/w/file/fetch/144815352/1_3_5_year_career_plan_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/255bda7f-3acb-4069-b762-353184637064/black_and_decker_weed_trimmer_string_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4420af72-d3e9-4114-ae3b-d335cfe3bc2b/kenmore_elite_washer_codes_f02.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78d9c077-7d5a-4385-8fcf-26b657b8dec5/19982939378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b8e27c1-8906-4fe5-b5a1-bfcc7392d4ef/40553108545.pdfIn PDF document text
    • http://donigipoz.pbworks.com/f/24770257081.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/f/36706827022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2b0eff0-92c5-465e-b82f-e1720e5fadcd/letelatejiburorevasud.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 6104 bytes
SHA-256: 201a5a8e8398132fc87fce02193740ce586384790c827c4d6521026c7c844292
font_01_sfnt_off0000fd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6B 2128 bytes
SHA-256: 2d805b03f77d847d6ede8c78c11d28ae4d41398806d8c4e0acececa74228dfde
font_02_sfnt_off0001073c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073C 15028 bytes
SHA-256: d2f5fe3de6998c0235d380c9fe2f22431c850312bf19a2a98f2be01438414c18
font_03_sfnt_off00013716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13716 16144 bytes
SHA-256: c5b81f703ebddc697e6824868dcd306aba919aa4c1ec28f594a83a04df97872b