Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a11cd44da16c1b0…

MALICIOUS

PDF

64.0 KB Created: 2021-02-25 17:42:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 21ab8114d2693d9a165b745c2d6dbc2d SHA-1: 91f097f397d73ebd9b30d30eedbf1e44ddfa64e2 SHA-256: 8a11cd44da16c1b08819c8f5004bee15929f623013171ba51d5ba3477dd3f6de
124 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism to host malicious content. The document body, though heavily obfuscated, contains references to a stovetop coffee percolator, likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9720

Heuristics 4

  • 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
  • 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=how+to+use+a+corningware+stovetop+coffee+percolator PDF link annotation
    • http://lomigakorak.getenjoyment.net/an_introduction_to_applied_econometrics_kerry_patterson.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/32596940560.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/11399059215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485696/normal_6012b85291bd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415326/normal_5febd01e90057.pdfIn PDF document text
    • http://starkrobotics.org/59385929119arniu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377381/normal_600104e5b5f99.pdfIn PDF document text
    • http://alphabitx.com/national_archaeological_museum_athens_guideci34g.pdfIn PDF document text
    • http://bcipreactivaperu.com/xufefadefupezuvesidemunaikkwp.pdfIn PDF document text
    • http://jowesomovuwo.iblogger.org/jaat_attitude_status_image.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/gem_trails_of_washington.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tizavoju.rf.gd/hello_brother_song_tamil.pdfIn PDF document text
    • http://legunexalutazu.rf.gd/how_to_program_a_motorola_cls1110.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/what_can_you_eat_on_the_10_day_challenge_diet.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/pip_photo_collage_maker_app.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/xakujizorim.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_off0000dd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD85 5296 bytes
SHA-256: 8e2e9c6cff2a6064fbece239f7095012fee8d537f46519cb2e9288d95036f004