Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7d595f9c4bad39…

MALICIOUS

PDF

68.7 KB Created: 2021-02-16 00:59:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1a6cf27cb06ad62bb05d6b571cfed018 SHA-1: 1c764e1cbb70981373601b2424cfda808fd9500a SHA-256: 8a7d595f9c4bad395175b14270354e828564ff1c3e78a4cec8e3c141a3ab5fa4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to 'military dog training manual pdf'. The presence of numerous external URLs, including one pointing to 'maypoin.ru', strongly suggests a phishing or malicious content distribution vector.

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://maypoin.ru/123?utm_term=military+dog+training+manual+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4472495/normal_600141278fc1f.pdfIn PDF document text
    • http://vseti.life/21853984262qq6w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450636/normal_5ff50eab5109c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482858/normal_5fd64d1d3a05d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487625/normal_5fcaf5c59c183.pdfIn PDF document text
    • https://zexirajeroluwub.weebly.com/uploads/1/3/4/8/134848753/vigikujexaviko_wexudi_molokan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480187/normal_5fff06e4e08ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456660/normal_600e5beba31f4.pdfIn PDF document text
    • http://mmamba.ru/endospore-_forming_bacteria_familyh2mlv.pdfIn PDF document text
    • http://simultaneously.space/1476004878808hiy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453115/normal_601c78e7ad5ff.pdfIn PDF document text
    • https://sipesavuw.weebly.com/uploads/1/3/4/6/134697333/bf937682c623e18.pdfIn PDF document text
    • http://krokoboko3.xyz/modern_arabic_short_storiesb91zi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/risudiwoditifafurafez.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/tusebalefifafisegasefapil.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/fanumowituwalewifatig.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/cecile_corbel_discography.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/extending_maternity_leave_letter_template.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE6 5288 bytes
SHA-256: 9066c6d93c5be4fdca7f39d368b65fcd0ae3bc8597ad03b62b858994aed8d880
font_01_sfnt_off0000e1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E5 10356 bytes
SHA-256: 584cedf6664610a5f4593a6c37543816cd60f06a982cd1f8d25195e33f8b27fe

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