Malicious PDF — malware analysis report

Static analysis result for SHA-256 09741e9733b11e90…

MALICIOUS

PDF

82.0 KB Created: 2021-02-01 09:40:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3702ffc334395a7d0e55fe4ba073f99a SHA-1: 41acdac057093c7dfb05bf03d638a4ca7a089f57 SHA-256: 09741e9733b11e90a2f11b21000103e3435b98c234071d713b972ae12d2b5bf6
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominently featuring 'baarspo.ru' and a query parameter suggesting a lure. Heuristics indicate the PDF is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, likely for phishing or to download further payloads.

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://baarspo.ru/aws?utm_term=abracadabra+korean+song PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408346/normal_5fe667070ca6f.pdfIn PDF document text
    • http://biteroz.iblogger.org/wasosuw.pdfIn PDF document text
    • http://logoped-samara.ru/pse_tuning_charttjwql.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427267/normal_5fde9fce628f8.pdfIn PDF document text
    • http://makeyourself.xyz/fastest_bowling_ball_speed_records1eug.pdfIn PDF document text
    • http://qupieasy.online/tafaxipalabiwejogulamur3yx6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428045/normal_600c47d6f2834.pdfIn PDF document text
    • http://naxawibumeso.iblogger.org/27917540967.pdfIn PDF document text
    • http://ctyr.ru/xogoxoxepm4ajd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405197/normal_5fe4aaae26c8d.pdfIn PDF document text
    • http://idealica-italiaufficiale.site/psicologia_de_la_posible_evolucion_del_hombrel1ito.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/xijuxosisomuna/30140528293.pdfIn PDF document text
    • http://fezekugagow.rf.gd/34309753865.pdfIn PDF document text
    • http://pumejusatojajeg.rf.gd/addition_sums_with_answer.pdfIn PDF document text
    • http://jisufuwoj.epizy.com/letter_format_for_college_trip.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/pakojige.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/aparichitudu_telugu_hd_video_songs.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_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 6456 bytes
SHA-256: 867ee1cdb9f348a801eacb11d9fa13a3c63868c1f79146c2e1ad65fc92fdace5
font_01_sfnt_off00010241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10241 5268 bytes
SHA-256: ff1052052e8674978ff2e2e0f09f3ca88962746f06618da2500ec6af46d4cbb5
font_02_sfnt_off00011437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11437 11552 bytes
SHA-256: 00a7f1766d7199d243abaff17e96ee57be84aa27c364c714e7c826492f42005a

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