Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf75a2fc1a67e864…

MALICIOUS

PDF

76.6 KB Created: 2021-02-27 23:06:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2ce3fddfd801834133f9f060fce3a969 SHA-1: ce1ddb3906f5c20d047d5aa11e9d18f6f5d35f6b SHA-256: bf75a2fc1a67e86452701ebcc8d54ee6936a47b66721989f7ece1469e45b2cfc
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though partially corrupted, includes a title related to cleaning a coffee maker, likely a pretext to disguise the malicious links.

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://zajinet.ru/aws?utm_term=how+to+clean+a+keurig+k10+coffee+maker PDF link annotation
    • http://soldonlakewood.com/my_cousin_rachel_full_movie_download_in_hindi_480p0d8c7.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/chigcy4/gugemevisoxevifuxonu.pdfIn PDF document text
    • https://motonolezigit.weebly.com/uploads/1/3/2/8/132814123/2498408.pdfIn PDF document text
    • http://egrn-order.online/perimeter_and_area_of_composite_figures_worksheet_answers4glf5.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/Bjinhac/incremental_meaning_in_business.pdfIn PDF document text
    • https://cdn.sqhk.co/jojevirelo/4ibYIgi/we_bare_bears_bubble_tea_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/f9QhhN6/stick_fight_the_game_mobile_apk_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/wabasenenem/C2SzgcQ/34820104357.pdfIn PDF document text
    • http://runolive.com/soxirafujamm258x.pdfIn PDF document text
    • http://lightstart.xyz/7_gauge_steel_sheet_thicknesssowhu.pdfIn PDF document text
    • https://riwusivi.weebly.com/uploads/1/3/4/9/134900433/26e4d841.pdfIn PDF document text
    • http://lightly.store/gotevotitunufemhpiav.pdfIn PDF document text
    • http://wowitaly.pro/dbx_166xl_compressor_manualj7758.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/jajjgh7/45765091948.pdfIn PDF document text
    • http://blankid.ru/fujopasezzeas3.pdfIn PDF document text
    • https://zosifoke.weebly.com/uploads/1/3/0/8/130813504/08ad17.pdfIn PDF document text
    • http://banquepopulaire-fr.org/rowotosuk89nt.pdfIn PDF document text
    • https://cdn.sqhk.co/menodotitit/hffKSgi/best_music_ringtones.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000edb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB8 5332 bytes
SHA-256: 59dfe48c3c9578b709c1110c71802fa398e66e4320512b2403376c869588749b
font_01_sfnt_off0000ffe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 10780 bytes
SHA-256: 3505769269952926430326ed536adaefbc3b4358a1cc5e27930d3b3cddcffdc1

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