Malicious PDF — malware analysis report

Static analysis result for SHA-256 144dbf458b5ae700…

MALICIOUS

PDF

59.6 KB Created: 2021-02-24 19:25:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2147e340bbaa5a53388fc955d1f7e135 SHA-1: 8ff756d2db1e064580c72684fb8922eb2eec2403 SHA-256: 144dbf458b5ae700512e0b8c677baff4ef0190c0af2754a3797d2b9610f3738c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a probable attempt to redirect users to malicious sites. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8774

Heuristics 4

  • 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
  • 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/award?keyword=open+source+music+appreciation+textbook PDF link annotation
    • https://dolepaxutafajur.weebly.com/uploads/1/3/0/9/130969408/3709124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502563/normal_5fe9ed4593189.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/T5Djbig/hearts_card_game_rules_for_two_players.pdfIn PDF document text
    • https://webolubodu.weebly.com/uploads/1/3/0/9/130969971/pazifatineru-gegiludoj-kasoj-terowar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412568/normal_600149c3c8d58.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/garmin_vivosmart_3_strap_replacement.pdfIn PDF document text
    • https://doxavigefixo.weebly.com/uploads/1/3/5/3/135391607/dosip_kuxux_mozuponizufomun_kumasafa.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/when_worlds_collide_song_spongebob.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/82586152915.pdfIn PDF document text
    • https://menufepu.weebly.com/uploads/1/3/1/1/131163725/zedirerijibiro.pdfIn PDF document text
    • https://zowadadevifu.weebly.com/uploads/1/3/4/5/134597758/1057634.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488582/normal_5fdd836860796.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485826/normal_5fc66b827a021.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kavibajegis.onlinewebshop.net/kavulujabavaluvokurosi.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/bonezat.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/43537535785.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 5344 bytes
SHA-256: 67641d03735db1539289244b3dfcd6a9625dbdc60cbc3ec38b6ea354bb216b2c