Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4d9ade2f922e39…

MALICIOUS

PDF

125.6 KB Created: 2021-03-18 06:59:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f98834b0328f836a162c340e0c8dede5 SHA-1: 6cb03ddb81cebe93e8baf027b06b5a8f1d53d80d SHA-256: ae4d9ade2f922e3976458f68237be48a4201cf17e8973cb69ad2b708466456fb
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL, identified as malicious by heuristics and ClamAV. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'instrumental variable method example', which is likely a pretext to direct the user to the malicious URL. No scripts were extracted, but the presence of an embedded malicious URL is a strong indicator of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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://golowaki.ru/wix?keyword=instrumental+variable+method+example
    • http://a1metromovers.com/possessive_pronouns_worksheets_for_grade_5d6csg.pdf
    • http://kellys.space/tabletopia_steam_loginz617i.pdf
    • https://cdn-cms.f-static.net/uploads/4505820/normal_60360b5cb2787.pdf
    • http://teenagetutor.net/bostitch_electric_staple_gun_manualu9029.pdf
    • https://cdn-cms.f-static.net/uploads/4386334/normal_600cb551eac59.pdf
    • http://loveworld.club/31073437112e52yw.pdf
    • https://cdn-cms.f-static.net/uploads/4403674/normal_604169d28e502.pdf
    • http://koteyarn.moscow/vmware_hcl_serverqgh4y.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/966940fa-d3bb-4d71-8c16-76a97f0334f1/pro_tech_compound_miter_saw_7208_parts.pdf
    • https://s3.amazonaws.com/rafiralexezol/patofisiologi_anoreksia.pdf
    • https://s3.amazonaws.com/gudukupir/best_innisfree_sheet_mask_for_dry_skin.pdf
    • https://uploads.strikinglycdn.com/files/28eca179-b4a4-444d-96e5-506c5c2b3ff5/the_norton_anthology_of_world_literature_shorter_third_edition_vol._2_ebook.pdf
    • https://s3.amazonaws.com/xotomisen/baghban_full_movie_free_480p.pdf
    • https://uploads.strikinglycdn.com/files/1852d7a2-ee53-45e2-b1dc-b1d36abaf515/gifoz.pdf
    • https://uploads.strikinglycdn.com/files/15469b60-b39e-40a9-8791-45cf70640ee6/how_to_recycle_canon_ink_cartridges.pdf
    • https://s3.amazonaws.com/nawosineromigi/division_negative_numbers_worksheet.pdf
    • https://s3.amazonaws.com/senodiw/critical_theory_in_english_literature.pdf
    • https://s3.amazonaws.com/fopalew/amazon_web_services_meaning.pdf
    • https://s3.amazonaws.com/jiwotarotavuz/postpartum_depression_definition.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_off0001af18.bin
fce76731cbf0beb3a030c35f2a17c73cea1b6f5dcb50cfebf14390d46b307d06
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF18 5404 bytes
font_01_sfnt_off0001c144.bin
d9e101d6c811435b8c7ab93695a322d0e224abcf39a39cb09ce41e214ae2afc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C144 11648 bytes