Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3cb27828371b7e3…

MALICIOUS

PDF

73.6 KB Created: 2021-02-03 01:53:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 3d249bc287f3f403dcd6a1a8f8c7125a SHA-1: e4294f311d58ca444eabb49478782047bdb4b50d SHA-256: f3cb27828371b7e37cea08288009a823150c968110829642a2bbbd5efa6d247b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. ClamAV and an ML classifier also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to malicious sites, likely for phishing or to download further malware.

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://jacksth.ru/aws?utm_term=bb%2526+t+auto+loan+payoff+information PDF link annotation
    • http://chelamela.org/quadratic_equation_completing_the_square_worksheetkhc4z.pdfIn PDF document text
    • https://tusagenitig.weebly.com/uploads/1/3/1/4/131452801/kifivuvi-dawovebituremig-jopinodi-gawupomagoto.pdfIn PDF document text
    • https://xuvupidorok.weebly.com/uploads/1/3/1/4/131407629/tosifidotadojiruf.pdfIn PDF document text
    • https://cdn.sqhk.co/daxegajok/Yq9ORrP/football_training_drills.pdfIn PDF document text
    • https://cdn.sqhk.co/kizusuvut/GghsgdI/legendary_titans_hack_apk.pdfIn PDF document text
    • https://penomagara.weebly.com/uploads/1/3/2/6/132695387/47f132e109dddb6.pdfIn PDF document text
    • https://cdn.sqhk.co/vopufepivipe/iiihhio/wolf_girl_and_black_prince_episode_11_vf.pdfIn PDF document text
    • http://graatorama.space/tavutajozejugeposap37akf.pdfIn PDF document text
    • https://cdn.sqhk.co/sezabaxo/Ajj6lgj/42244023376.pdfIn PDF document text
    • http://znalomstvavip.site/dumemewujuvigkw7lu.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/minabiwa/kick_off_meeting_template_powerpoint.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/31815505324.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/belgium_league_table_form_and_standing.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/tupowolavik.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/measuring_length_worksheets_grade_5.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/lujefopemopatuneso.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/play_store_slow.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/gujarati_calendar_august_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/waze_c3po_voice.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_off0000e3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B7 4348 bytes
SHA-256: fdeba82ea8718aa8adc37038f510834aa065b5ca8a4529d6409ac4462e62f7b3
font_01_sfnt_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 11772 bytes
SHA-256: ece4f52a8c1482bd6826beff17ccbe11032c1f3f4084bfb22a1fb01ed33f4aea

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