Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d4c81bcc73b25e…

MALICIOUS

PDF

77.5 KB Created: 2021-01-16 04:46:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4efe6daaf7f006ded8579ba9eca4d0cc SHA-1: 27e8166da3fa040c486806417b006a653c2b0f04 SHA-256: a7d4c81bcc73b25e73f99e4e1ab12b9b754f03617b8884e4f3505037c20eb379
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'https://traffnew.ru/123?utm_term=jamba+juice+franchise'. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to potentially malicious or deceptive content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://traffnew.ru/123?utm_term=jamba+juice+franchise PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479705/normal_5fdc03e7df3e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419204/normal_60024e1d23157.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/2evAgh4/17473612078.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/2ijjhex/cutters_barber_shop_sofia.pdfIn PDF document text
    • https://menesifewo.weebly.com/uploads/1/3/0/8/130814293/bugaguledozedo-dekopudap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489601/normal_5fbd667ec18b0.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://s3.amazonaws.com/rufonali/43647722173.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/64651168816.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/49131232687.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/nedoxanalodulatunasowede.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/kusoviwikoginifeledu.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/free_my_side_of_the_mountain_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/citra_emulator_pokemoner.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/21262530362.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/66834011991.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_off0000e1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 4988 bytes
SHA-256: f0c730a200580d1a28ea6b9800e96d26d3fbc53e9d5389b9b0ad953022edad10
font_01_sfnt_off0000f261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF261 11716 bytes
SHA-256: 04eda63f7f5af080aa5ff008565f8143f1bf4b1f19167351c4bfbdc3edfd2e6c
font_02_sfnt_off00011975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11975 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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