Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56db86ed7b28f0c…

MALICIOUS

PDF

85.5 KB Created: 2021-06-14 12:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 307aeaa977ce0fb6814589144d620308 SHA-1: c913eca20a54b34edc24faf7c2aacbd475a4abd5 SHA-256: a56db86ed7b28f0c35c75ce357cdfee9956995964a1f63f94c78036554ed8e88
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 5

  • 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.
  • 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://coretry.ru/pbw?utm_term=whatever+whoever+whenever+wherever+exercises+pdf PDF link annotation
    • https://kosemopadil.weebly.com/uploads/1/3/4/6/134669244/4880572.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446283/normal_5ff9382582f3c.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4387698/normal_60b4abf2cbbc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473044/normal_5fcf21327a880.pdfIn PDF document text
    • https://boxenujanazikof.weebly.com/uploads/1/3/5/3/135302290/domobibis.pdfIn PDF document text
    • https://nalodewemutut.weebly.com/uploads/1/3/1/1/131164475/b8edf146dd223.pdfIn PDF document text
    • https://vadugoza.weebly.com/uploads/1/3/4/5/134599956/3346795.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_605d45f939db6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377114/normal_5ffa3ee3757d7.pdfIn PDF document text
    • https://poxovoxi.weebly.com/uploads/1/3/5/3/135398301/fulumepenuxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452157/normal_5ffdffb767bea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451574/normal_6002d1a940069.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/fd36ee5e-81e3-4b07-8535-4561217be01d/are_anker_products_safe.pdfIn PDF document text
    • http://sinorodolu.pbworks.com/f/torefotolekawaxoweno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4a3d5be-bb2e-4524-8a46-01490cce90f3/46160448153.pdfIn PDF document text
    • http://mugobug.pbworks.com/w/file/fetch/144945048/46667679064.pdfIn PDF document text
    • http://mumubib.pbworks.com/f/40860724403.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013207.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13207 16272 bytes
SHA-256: 7d2271abb882dd8c3ceb11434b4b5548e43176a4a75afc5557f8f46a852a8132
font_00_sfnt_off0000f043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 5444 bytes
SHA-256: 91b4dc792416fc6361fdc689911ee1dbf124b8a908176ec6258a7f6659955a2c
font_01_sfnt_off000102e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E2 14988 bytes
SHA-256: fce06ae0c8f1bc2614811cff7209695b8f593396fb15f5e6079e9986b2ebe9bb

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