Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7a5831ce551277…

MALICIOUS

PDF

85.9 KB Created: 2021-03-13 15:12:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 168554c798e3f23701df410469990632 SHA-1: 42191b4203b54b1c04bceaa670d457d8620618c6 SHA-256: 3b7a5831ce5512776e108185ae70745b2e721f63a2a8480f28731377f6d2c62e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to disguise malicious content within a large number of links. The primary URL, 'https://fokemale.ru/award?keyword=shunt+capacitor+compensation+pdf', suggests a lure related to technical documentation, likely to trick users into visiting a compromised site for phishing or malware delivery.

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 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://fokemale.ru/award?keyword=shunt+capacitor+compensation+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426413/normal_5fe7aee534d3d.pdfIn PDF document text
    • http://lurobur.iblogger.org/13186980970.pdfIn PDF document text
    • http://dom-bita.org/28356928352armuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483833/normal_5ff07ae90cfcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499285/normal_6035528e654c4.pdfIn PDF document text
    • http://dafiwugoxafirop.22web.org/36852832992.pdfIn PDF document text
    • http://fashion-deals.xyz/atlas_of_morphology_and_functional_anatomy_of_the_brainqgp10.pdfIn PDF document text
    • http://lefibipefazefep.mypressonline.com/what_is_the_main_purpose_of_lawyer.pdfIn PDF document text
    • http://ketousa.site/louise_hays_park_trail_map9vvlj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370266/normal_6016435308d5e.pdfIn PDF document text
    • http://hookup668.site/pifidi6fsl7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375889/normal_5ff46469c030d.pdfIn PDF document text
    • http://rabizepafuxonag.mypressonline.com/18143345794.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://semerobaragizeg.epizy.com/ibd_examiners_report_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/when_your_garbage_disposal_stops_working.pdfIn PDF document text
    • http://tegazadolital.rf.gd/nedubosuged.pdfIn PDF document text
    • http://junenizexi.epizy.com/53622475663.pdfIn PDF document text
    • http://suwiwozeko.rf.gd/32489555119.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/rerexulenowijagimit.pdfIn PDF document text
    • http://muxuvakuxu.rf.gd/65069173109.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001128b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128B 5464 bytes
SHA-256: 719ddd70c2ab80ff798c527b250130752144c38b121eb0be7d159d4313aa5d49
font_01_sfnt_off000124fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FB 10952 bytes
SHA-256: 99d654b34622d1373c3f8c551e35ffe0eb79e519ae28f905aa113b6e873479ea

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