Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7a4434c4f38c5b…

MALICIOUS

PDF

81.2 KB Created: 2021-01-27 09:52:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 48e2ca86cc30b53361709834d50a733e SHA-1: 9e21e5613e06f18a2f849cb8d8a6f95ec72faa66 SHA-256: 8a7a4434c4f38c5b290f1cd0daa649ecc7189e1ee92bcb86c39f567a374b62e1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to a potentially malicious domain. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to sewing machine repair manuals, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/123?utm_term=brothers+sewing+machine+repair+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4406241/normal_5ffade6d15341.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385207/normal_5fd799c3e12d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451027/normal_5fe31ed7d3cc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468572/normal_5ffe9717ae7fa.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/MOibmji/94676606309.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/jiWMQz4/steroid_brick_breaker_shooter.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/j9ijiRH/67327514708.pdfIn PDF document text
    • https://dizakevusarebiz.weebly.com/uploads/1/3/4/5/134581037/piwiti.pdfIn PDF document text
    • https://fuwupizur.weebly.com/uploads/1/3/5/3/135390256/fdf75c1aa8819d0.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/tjeWbhc/tickets_radar_concerts_sports_theater_festival_2020.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
    • http://rukilokurotog.rf.gd/6504678825.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/dotosam.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/20_tane_bileik_forml_ve_adlandrlmas.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/62543921636.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/broodstock_management.pdfIn PDF document text
    • http://sodexodape.rf.gd/durumujaboti.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/arterial_ulcer_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/bollywood_movies_mp4_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/baberojosubin.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_off0000f0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 5368 bytes
SHA-256: cf8205440001a845f3a1c0ae836a9a700cac81aa0a85c20bb442c2fd778a6a04
font_01_sfnt_off00010323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 11432 bytes
SHA-256: d986e7db3520d7305e53543bbb5d0f2805093320f24452ba62e21830cb2de45a
font_02_sfnt_off00012906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12906 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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