Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b1efb944e4d50f…

MALICIOUS

PDF

103.3 KB Created: 2021-02-05 11:21:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6c0f74e8a5e8c6042e030387db55fe5 SHA-1: bc6e57a1016675725f019eb20ee8cfaa67aef3e8 SHA-256: a8b1efb944e4d50f924c936f9470fc1bb083af8cbe1a5ed619e096525a1a12e4
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious lure designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://bologen.ru/aws?utm_term=housing+crisis+ireland+pdf
    • http://lnstagramsecurity.net/la_la_land_audition_piano_sheetlvqgn.pdf
    • http://godubumoze.iblogger.org/lonetufomivofud.pdf
    • https://static.s123-cdn-static.com/uploads/4470401/normal_5ff86ecf00e65.pdf
    • https://static.s123-cdn-static.com/uploads/4487662/normal_6001f2648c896.pdf
    • http://bonboxstudio.com/download_3d_racing_games_for_java_mobilespcrfn.pdf
    • https://static.s123-cdn-static.com/uploads/4464080/normal_6006e3088ea66.pdf
    • https://sajozigita.weebly.com/uploads/1/3/0/8/130814351/zuferopetanoto.pdf
    • https://nibapexi.weebly.com/uploads/1/3/0/9/130969889/958b690.pdf
    • http://lobarularexe.iblogger.org/moposetuvedofenumuzuze.pdf
    • http://littlenat.space/my_boy_gba_emulator_gamesi3z1d.pdf
    • http://stalekost.site/jirexuzotuxiret2h69.pdf
    • http://xodikiz.iblogger.org/cnidarian_diversity_polyps_worksheet_answers.pdf
    • http://lenudes.com/775404911335v3a6.pdf
    • https://xevivipemasap.weebly.com/uploads/1/3/4/4/134481894/21679.pdf
    • https://mabajiluvepe.weebly.com/uploads/1/3/1/4/131409333/fototowegovizuj.pdf
    • http://cccckkkkkdd.space/mtb_step_3_downloadmpsfj.pdf
    • https://cdn-cms.f-static.net/uploads/4415525/normal_6015d0c50afbf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nabifovu/annual_maintenance_contract_report_format.pdf
    • http://joxumokuri.epizy.com/31707748414.pdf
    • http://vutuzirowu.rf.gd/rogerian_argument_essay_format.pdf
    • https://s3.amazonaws.com/dixaleko/10981243294.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001576e.bin
bd8c7510e9536ef8524317a1287883be25b9290f55c3ad024572c322a955b414		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1576E 5284 bytes
font_01_sfnt_off00016978.bin
d0bb432e907205c04644a2ace27ddbdaa482a783b4b80670b6b0f0a237407da2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16978 11168 bytes

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