Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63ad69c0a92310c…

MALICIOUS

PDF

89.2 KB Created: 2021-04-23 04:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 85b31ae24346b4d2aa8d34a77250665a SHA-1: 7600958df7d093fbc87abab1cf29e0ee87b3b953 SHA-256: c63ad69c0a92310c51d7a6efb2d6fc6f5374deb6121c08063bb8e221c3b5e86a
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The presence of a 'utm_term' parameter in one of the URLs suggests an attempt to track user engagement or direct traffic. While no scripts were explicitly extracted, the heuristic firings strongly suggest malicious intent related to link distribution and potential redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://vilenefex.ru/strik?utm_term=how+much+can+you+increase+rent+in+nyc PDF link annotation
    • https://zavigajigufuf.weebly.com/uploads/1/3/1/6/131637719/5087222.pdfIn PDF document text
    • https://jowidirususonin.weebly.com/uploads/1/3/0/7/130775515/zoxirifu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478383/normal_5fe5494abde8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368781/normal_602add777d250.pdfIn PDF document text
    • https://nifatukipukixe.weebly.com/uploads/1/3/1/3/131398430/laboxixezavelo.pdfIn PDF document text
    • https://risidetumul.weebly.com/uploads/1/3/4/3/134320066/radekekakekabonuvup.pdfIn PDF document text
    • https://disumudumoronu.weebly.com/uploads/1/3/1/4/131408153/6247fc4607.pdfIn PDF document text
    • https://rojuligu.weebly.com/uploads/1/3/0/9/130969709/2064183.pdfIn PDF document text
    • https://wibarojadika.weebly.com/uploads/1/3/4/6/134689619/bisimokagu.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/2b663ac5.pdfIn PDF document text
    • https://magivuvesef.weebly.com/uploads/1/3/0/7/130775451/jiwagogexafixo-tikubajexun-furexolesobu-fulimuluzemiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383460/normal_6014678a753a7.pdfIn PDF document text
    • https://tamoniwezetiro.weebly.com/uploads/1/3/5/9/135961995/misesesedarokek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370303/normal_600a552f8fa67.pdfIn PDF document text
    • https://nasavizar.weebly.com/uploads/1/3/5/3/135322571/e77fd2febc4.pdfIn PDF document text
    • https://sapujufokobifaj.weebly.com/uploads/1/3/4/8/134847621/8190278.pdfIn PDF document text
    • https://rejileju.weebly.com/uploads/1/3/4/3/134335231/9aaa0d7ba0eb403.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_ef3993d4a6ca4663b6a97cc6adf17f6b.pdf?index=trueIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_5df3844ed2f440d297bc38555ca4ed44.pdf?index=trueIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_1a9d45c88a6f40db8ccb0f060bfef9c8.pdf?index=trueIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_f9d886b2c50a4b05a885a2889ab7cf01.pdf?index=trueIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_01939e5d000b47969b0ad68a31aad407.pdf?index=trueIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_cec34e2d84064be7a7e618dc9e4bd60a.pdf?index=trueIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_5e4b9b6e8c61476bad00e2824ec5f4e1.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_off00012026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12026 5164 bytes
SHA-256: c2e3e6e49033818c2fef33cbf7a0b0baaff5265073878b7a2b18564662ec1289
font_01_sfnt_off0001319c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319C 11104 bytes
SHA-256: 085c8c840bcbcfd892f2f2fc775bdf5b6865dc49ccfc51ba6dd378739108a867