Malicious PDF — malware analysis report

Static analysis result for SHA-256 611abb830ec3fc53…

MALICIOUS

PDF

71.9 KB Created: 2020-12-05 20:17:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b8eaab06e13e1932b0efe3639fa90727 SHA-1: d04b76d5c15a85fa90a2481d2eba9dc34d20c7f8 SHA-256: 611abb830ec3fc53ffd1db8f0244a057322f400c9260a5cf6c493d67ff30af3c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm designed to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via the embedded URLs. The document body, though heavily obfuscated, contains metadata suggesting it's a generated PDF, possibly for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/aws?utm_term=international+journal+of+clinical+aromatherapy+pdf PDF link annotation
    • https://pexulowiseguwuz.weebly.com/uploads/1/3/4/3/134391342/2661334.pdfIn PDF document text
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/6161540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425217/normal_5fa9902575399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381539/normal_5f9f96a61c612.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_5fc14dd924994.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/562633.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368746/normal_5fc825d13abfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367299/normal_5f9c63e7e919c.pdfIn PDF document text
    • https://bejivuvepezera.weebly.com/uploads/1/3/4/4/134437422/bebori.pdfIn PDF document text
    • https://jewadasin.weebly.com/uploads/1/3/4/6/134604584/bufirit_nukefowake_gugoba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417030/normal_5f9d8b1b4e566.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc52a646b97992eb5777856/t/5fc696d42dd96f5918d3e52d/1606850261800/wafajidipapedoladezaf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BC 5332 bytes
SHA-256: 35d722591b52d99c8d3c82ecd0ccaa91c5e8ea692c04052632182ffa642347b7
font_01_sfnt_off0000d6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C6 11388 bytes
SHA-256: 8d5f6c78f762e9c5d5cb202c22c0a786bb7065a118c1086024ddb5096c425b8e
font_02_sfnt_off0000fcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF4 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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