Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72ffb112cd4d146…

MALICIOUS

PDF

85.9 KB Created: 2021-01-29 06:03:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: f904f7b97c48ee990e6d14094ea5c735 SHA-1: 7133f2f63d7a306e97ce25a0e9ffb487704c2313 SHA-256: b72ffb112cd4d146c74bcf57f45726d527b7688419133dbb4793afd9ae6d8f9e
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and utilize UTM parameters, suggesting a phishing or spam campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a link farm on disposable hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards an attempt to redirect users to malicious sites.

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://jottigo.ru/123?utm_term=shotgun+shell+christmas+lights+home+depot PDF link annotation
    • http://itayoga.space/atrofia_del_nervio_optico6t8kx.pdfIn PDF document text
    • https://cdn.sqhk.co/wefekoferu/ien5Yii/14977008505.pdfIn PDF document text
    • https://cdn.sqhk.co/mowasikuso/ejfjdHq/how_to_write_a_proposal_letter_for_grant.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/2LifMOh/giant_stress_ball_kmart.pdfIn PDF document text
    • http://nibelv.xyz/timajeretazevatefimon8w34h.pdfIn PDF document text
    • https://cdn.sqhk.co/sezunofubuzi/ggwjIgh/golf_orbit_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/pobumepova/5idDVib/shoot_bubble_extreme_game.pdfIn PDF document text
    • https://cdn.sqhk.co/daxozazon/ihq2jah/happy_wheels_unblocked_at_school_hacked.pdfIn PDF document text
    • https://cdn.sqhk.co/wisaputal/eJijBEE/gejapokonunididuxel.pdfIn PDF document text
    • http://trixy-matrix.space/wooden_castle_blocks_ukj3cbp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nujexaraxeb.epizy.com/studio_background_full_hd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/88482267433.pdfIn PDF document text
    • http://temekem.epizy.com/98410049172.pdfIn PDF document text
    • http://xatabiraluxuded.rf.gd/nezaf.pdfIn PDF document text
    • http://jogakedom.epizy.com/duwowenutamumejavun.pdfIn PDF document text
    • http://sonapap.rf.gd/jofolin.pdfIn PDF document text
    • http://kisepupiregeseb.rf.gd/t_alphabet_wallpaper.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10486 5472 bytes
SHA-256: 9dd108a029fcc2592f27b14caeab5e109f50da4c3076ef8adcc00e44015fa89d
font_01_sfnt_off000116ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EE 10988 bytes
SHA-256: 8a7719bc86447ea1e29b77f24c041d586d3da92ff9ab3583f82d61979928243c
font_02_sfnt_off00013c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C31 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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