Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bbaab6b05218f21…

MALICIOUS

PDF

70.8 KB Created: 2021-04-12 00:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75e350efd5bd8850c038b711b1d2bd14 SHA-1: 22acb3ac64c4e37376dd02296e41a0e9e6835d74 SHA-256: 4bbaab6b05218f2180d899822637a4370f625e333bf5aab81f50fc5baf382ef9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive external linking suggest it's designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=mechatronics+book+pdf
    • https://jijaxiwiruba.weebly.com/uploads/1/3/5/3/135333012/lidix-jupadiwoxox-wizerezaxam-difubejinoxeza.pdf
    • https://cdn.sqhk.co/fabetojowuje/jjjaibX/crowder_songs_lyrics.pdf
    • https://cdn.sqhk.co/bupusudiva/zjf67ig/8850769297.pdf
    • https://tajafakedebufu.weebly.com/uploads/1/3/1/4/131438499/vatupi_vofezugevuwedu_rusen.pdf
    • https://wujupeduluruwuv.weebly.com/uploads/1/3/5/3/135316277/9664672.pdf
    • https://lopuvekire.weebly.com/uploads/1/3/0/8/130813144/4f5ec45e6e1.pdf
    • https://cdn.sqhk.co/vesagivara/3WjjjdC/pimuzudi.pdf
    • https://miwimuwal.weebly.com/uploads/1/3/0/7/130775744/318f6d0ad.pdf
    • https://niwarixetawozav.weebly.com/uploads/1/3/4/1/134108921/5040353.pdf
    • https://sagezawi.weebly.com/uploads/1/3/4/3/134322896/7975187.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://beninoduvewer.epizy.com/times_tables_practice_worksheets.pdf
    • http://zasasopatadinu.epizy.com/difobalusake.pdf
    • https://s3.amazonaws.com/wumodukubaru/26170132955.pdf
    • https://s3.amazonaws.com/rojalexipokadaz/how_to_punch_a_punching_bag_properly.pdf
    • https://s3.amazonaws.com/jobavo/where_can_i_watch_a_time_to_kill_free.pdf
    • https://s3.amazonaws.com/gawabog/bootstrap_3_navbar_dropdown_login_form.pdf
    • http://ligunatiresid.epizy.com/18925705801.pdf
    • https://s3.amazonaws.com/dafumuxitupav/graphing_trig_functions_review_worksheet_answers.pdf
    • https://s3.amazonaws.com/xilasisefi/toughest_maths_riddles_with_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d3.bin
7b0e81dea3703d5f1ef7c9f0a0349f546c0e66238a25bef22bd8752d98eea779		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D3 5420 bytes
font_01_sfnt_off0000ea43.bin
900b1826c81091f202d1835d30f9c3992f8a97b755d7b187e7000c3f8c03c9e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 10556 bytes

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