Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fedeab28ed0072…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 22:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 16a29fbbee06296fa24b49c088aa953f SHA-1: f45d0d0e4109bf14d3828f959c86589f17fedf23 SHA-256: f4fedeab28ed0072eb9f32827729b4aa2be70be3db27ccb247ffd13cc56414f8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of external URIs and a deceptive download button, suggesting a social engineering lure. The numerous external links, many pointing to disposable domains, reinforce the phishing and malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=ps3+roms+download+for+android PDF link annotation
    • http://barrybusiness-crm.com/ressource/devis-photo/files/81316517275.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/65000987647.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210909205033.pdfIn PDF document text
    • http://www.bandungmesin.com/file/jutitagelosiw.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-5/20210905191020712953.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/tasav.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1631079189.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/kisubamukezexaxutojutezox.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/11923209961.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/dolefisojolet.pdfIn PDF document text
    • https://marlin-shop.ru/ckfinder/userfiles/files/4931736775.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210908121034.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/xizaz.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/10612921239.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/78682020415.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/9899952256.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/35320841163.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/27869575351.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/35034543386.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/38765422073.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/83705373320.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/dazolumurewezujake.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/46095899773.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/22233354483.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/39800015653.pdfIn PDF document text
    • https://claudiodituri.it/uploads/parifavifazosi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 19564 bytes
SHA-256: 34f142581e1c6794ec77041af5a6fb0428f646e285aca47d750e96051720a2fe
font_02_sfnt_off00012c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C70 10544 bytes
SHA-256: a3c97e375092a66e8d02ac473cd99dcf58a8c3fc63f39a4c2cc762fdb8b1b28c