Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4780f694365c62a…

MALICIOUS

PDF

66.8 KB Created: 2021-09-29 00:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0fa8ca3dfa3019ff441cf7087ae57d1a SHA-1: 9ff5d0e4f2b018223c1ec2be2295ff45e28b486f SHA-256: e4780f694365c62ae2c6900616ba03c2152f2fdf422b949e3ce455493097e668
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an image-only design with a clickable action, typical of a screenshot lure designed to redirect users to external URLs. The heuristics indicate it's a link farm on disposable hosting, suggesting a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://synerhu.ru/uplcv?utm_term=android+studio+custom+theme PDF link annotation
    • http://zimmerei-possert.at/popomabukuvukosixori.pdfIn PDF document text
    • http://kadet-ck.cz/pic/file/kowuzuse.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/vuvoselalexoduranaka.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/putojewebuwezude.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/93634255830.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/53878781450.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/97885940016.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/wapusisurosod.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/71692933343.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/51345018194.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/48245205136.pdfIn PDF document text
    • http://edituj.cz/res/file/zepimuwimuwezeluripawa.pdfIn PDF document text
    • http://marcuspietrek.de/MARCUS/files/file/kilidurokenum.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/sububekipejofurakisup.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/39863518552.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/3442743020.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/84903360468.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/63909695025.pdfIn PDF document text
    • http://fruitsad.pl/images/file/vovipunudofemid.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/sozozenetikegamuwe.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/kezafobovogiwegebuzabupad.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/7106289189.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_off0000ab09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB09 10508 bytes
SHA-256: 96fc67dc8172e84851f47237d80a4a8e1b4ed0206a8da646942d566efc3ec607
font_01_sfnt_off0000c2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CF 14140 bytes
SHA-256: 2962a47aad60a558217de3a1c1bcebfcfaa14313cf07ba0574bf0a513efc7eb4
font_02_sfnt_off0000e5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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