Malicious PDF — malware analysis report

Static analysis result for SHA-256 159a88ef6d51f9d0…

MALICIOUS

PDF

81.8 KB Created: 2021-04-05 13:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a5006789335c5ce41e3200f29f209ac1 SHA-1: a378905b6ecedea8a1b009ffe86e111b5cda7585 SHA-256: 159a88ef6d51f9d0baaf8b1625e7746a070c9fcd317c01821eaf6499a7854276
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to other PDFs. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing sites, likely as part of an SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://pelibifir.ru/award?keyword=balanced+diet+chart+for+adults+pdf PDF link annotation
    • https://cdn.sqhk.co/bilexodofose/5gfjb9P/bulleit_bourbon_barrel_strength_batch_5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369640/normal_6065df8732ebb.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/Lie6ge7/voxiledobozizemir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456660/normal_6013f53968a2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372101/normal_604ca83f2638f.pdfIn PDF document text
    • https://mifafuriladivu.weebly.com/uploads/1/3/4/7/134733471/jesavikogulob.pdfIn PDF document text
    • https://dutebosolet.weebly.com/uploads/1/3/0/9/130969562/716b2128f81f6.pdfIn PDF document text
    • https://gewuvakir.weebly.com/uploads/1/3/4/6/134660990/zibub_gizegegopofiv.pdfIn PDF document text
    • https://zupelewelasilag.weebly.com/uploads/1/3/4/5/134594614/539376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495975/normal_605dfb2f43dab.pdfIn PDF document text
    • https://sivavodafewe.weebly.com/uploads/1/3/4/4/134484486/fosegaf-zanime-nelawu.pdfIn PDF document text
    • http://sijemogezabusa.sportsontheweb.net/character_development_in_film.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bfe8298-f7c0-4ca0-acdb-713b87d39cf1/how_to_do_calligraphy_with_markers.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/jafej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b69eaa50-1db9-4f50-b60d-974b1de37539/tomugewi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aabbf25e-e143-437d-bda9-91b4c5f16582/music_an_appreciation_roger_kamien.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/aalwar_audio_song_tamil.pdfIn PDF document text
    • http://vekemelegewimo.atwebpages.com/best_21_inch_lawn_mower_blade.pdfIn PDF document text
    • http://kepagewav.atwebpages.com/chacha_chaudhary_comics_books_in_english.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_off00010475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 5292 bytes
SHA-256: 35912ab5456503b3d36329a6d2926388cdd3f8dd8ee022790cb0be0b3c56929f
font_01_sfnt_off0001166c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166C 10532 bytes
SHA-256: 7cc97916f8c755c7d743fee9b141873700937e004cb9a12c5dc4fe4e7fe555fd

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