Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f9474c3d366bf9…

MALICIOUS

PDF

92.6 KB Created: 2021-01-11 17:45:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f34d27883a1ebf14cbfcb50ea905fe2d SHA-1: b784e77340f8a0e0a769830df99c0882fcd1e916 SHA-256: b3f9474c3d366bf90d8f940b96d95bb349d7279a51a1256ec2a1f75596295bb8
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link to known malicious infrastructure and a PDF link farm. The embedded URLs suggest an attempt to direct users to potentially harmful content or phishing sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://cctraff.ru/123?utm_term=rock+me+momma+lyrics
    • https://gakokoxexoboj.weebly.com/uploads/1/3/0/7/130776672/bezuva-lawud-gesaganamo-xuwalubineb.pdf
    • https://puriruwuz.weebly.com/uploads/1/3/5/3/135395363/wowazodanimet.pdf
    • https://cdn.sqhk.co/riketumes/zDBdhig/resident_evil_7_game_download_apkpure.pdf
    • https://static.s123-cdn-static.com/uploads/4383449/normal_5fcf200d22122.pdf
    • https://digeforoxega.weebly.com/uploads/1/3/4/6/134668277/623f5370fe5ca8d.pdf
    • https://cdn.sqhk.co/ranotigu/haxgc5V/lowes_near_me_now.pdf
    • https://cdn.sqhk.co/dorejewibiz/idghhgo/tree_of_savior_team_names.pdf
    • https://sotogirepatobob.weebly.com/uploads/1/3/1/4/131453915/5327612.pdf
    • https://cdn.sqhk.co/numiwufeguv/ifhshbB/51657526443.pdf
    • https://cdn.sqhk.co/bitomasijelo/xDha5jf/pixel_battle_arena_multiplayer.pdf
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/radil.pdf
    • https://site-1171131.mozfiles.com/files/1171131/puzzle_box_walkthrough_all_level_27.pdf
    • https://baxemajoxololur.weebly.com/uploads/1/3/1/0/131070692/tikojug_zeduwusaraz_suzevilunukixe_magelazolile.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/viwoxuz/avery_return_address_labels_5162_template.pdf
    • https://s3.amazonaws.com/purawuma/meri_banno_ki_aayegi_baraat_songs._pk.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_off00012af4.bin
efed1649e41ee8dd652723e482d8017b7c324434f3256c8050cad84130ab51e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF4 5120 bytes
font_01_sfnt_off00013c53.bin
99318d054d8d6dfc59eb5aed23fcf3a45002683939668910274d1e5e3f4ab4c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C53 12212 bytes

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