Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d11281d6abc22b…

MALICIOUS

PDF

80.1 KB Created: 2021-05-06 08:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6c78d2f6a5fa42caeaf8d575f6fff592 SHA-1: 41faac50dbb0dd909176b8fa22b68bfe6b2e717f SHA-256: 87d11281d6abc22b668792f48e7aa9e541cd35cef23e61de98d2b8cd4d19157f
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 hosted on disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata related to 'restaurant franchise operations manual example', which is likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=restaurant+franchise+operations+manual+example PDF link annotation
    • https://cdn.sqhk.co/kixituvelil/sxieahh/senivunadedibuleme.pdfIn PDF document text
    • https://jevokave.weebly.com/uploads/1/3/4/2/134266272/5035019.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/legaparuk-gorelop-jomivomaradezi.pdfIn PDF document text
    • https://cdn.sqhk.co/xadakede/7L7jc9W/18459226862.pdfIn PDF document text
    • https://jojiwunu.weebly.com/uploads/1/3/5/3/135387754/fululowetuxi_pejiw.pdfIn PDF document text
    • https://zunutupere.weebly.com/uploads/1/3/1/4/131453944/606fbc.pdfIn PDF document text
    • https://vizisovi.weebly.com/uploads/1/3/4/1/134131984/288919.pdfIn PDF document text
    • https://cdn.sqhk.co/dijowasedop/l0J5jfO/lesofa.pdfIn PDF document text
    • http://lazerepil.site/289546104503ycpp.pdfIn PDF document text
    • https://zikixitifo.weebly.com/uploads/1/3/4/8/134897390/7041744.pdfIn PDF document text
    • https://cdn.sqhk.co/xomakonezema/gdig51U/baresusazarilapo.pdfIn PDF document text
    • http://iciapp.xyz/rixijuzosaxatibamk1yv.pdfIn PDF document text
    • https://sirabirimafo.weebly.com/uploads/1/3/0/7/130739431/fabedoridaker.pdfIn PDF document text
    • https://cdn.sqhk.co/titolegun/ohe4hgg/mikefuvujaruful.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/towakog/93396803781.pdfIn PDF document text
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_7aa6bd02d25c462788255f8f2acafd05.pdf?index=trueIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_58aa01d4bc564b85bbd54f65608170e2.pdf?index=trueIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_66069fb333fb41fdaecf42beb4d16748.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/xubefimonasixidiroj.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_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 5212 bytes
SHA-256: c9a2a0be65a176fb8b9ee3d40694ec68cf12e88d16571d171f447f6291c92e7a
font_01_sfnt_off0000ffb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB6 10984 bytes
SHA-256: 9c2ca6200b84f3450caf8ac92b799ced9d8876c98a55445dbea713725b24c63b
font_02_sfnt_off00012525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12525 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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