Malicious PDF — malware analysis report

Static analysis result for SHA-256 9218b92a9e7b3dfe…

MALICIOUS

PDF

98.1 KB Created: 2021-05-12 14:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 96e16576db98bb00801676d044d974ea SHA-1: 9873dab53d7c41e30633c4a72c73d1445eb5d26f SHA-256: 9218b92a9e7b3dfea2613b28e82f55435db64e6b793c749e86995850d5b03fb9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on S3 buckets and Weebly subdomains, suggesting a link farm or SEO poisoning tactic. One of the primary external URIs, 'https://druttle.ru/strik?utm_term=xbox+one+controller+bluetooth+connected+but+not+working', is presented in a way that mimics a search result, likely to trick users into clicking. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 5

  • 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 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.
  • 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://druttle.ru/strik?utm_term=xbox+one+controller+bluetooth+connected+but+not+working PDF link annotation
    • https://vodemilofokuse.weebly.com/uploads/1/3/4/2/134235674/3b44eea2.pdfIn PDF document text
    • https://xetudutadoboja.weebly.com/uploads/1/3/4/3/134344850/7025292.pdfIn PDF document text
    • https://werakemil.weebly.com/uploads/1/3/5/9/135973214/7792299.pdfIn PDF document text
    • https://varijamali.weebly.com/uploads/1/3/1/8/131856150/b1920e.pdfIn PDF document text
    • https://nejavedejelije.weebly.com/uploads/1/3/4/3/134336697/3104982.pdfIn PDF document text
    • https://fobafomenizu.weebly.com/uploads/1/3/4/7/134753661/04484e9.pdfIn PDF document text
    • https://sazisibibufesu.weebly.com/uploads/1/3/4/3/134339611/rumigoratuwin_litapawabojitux.pdfIn PDF document text
    • https://nulebuset.weebly.com/uploads/1/3/1/4/131411431/taneje_mexuguwinarilop.pdfIn PDF document text
    • https://lumirofelefepo.weebly.com/uploads/1/3/4/8/134892557/kamotaki-wezadezutuwo-ximituluwonuzer-gabej.pdfIn PDF document text
    • https://xibuzapesajeg.weebly.com/uploads/1/3/4/2/134236274/935bbde.pdfIn PDF document text
    • https://vikenefimedok.weebly.com/uploads/1/3/4/3/134390201/welasoga_miramiku_levorof_peterusunol.pdfIn PDF document text
    • https://xuzojawuwakobo.weebly.com/uploads/1/3/4/3/134312069/2131085.pdfIn PDF document text
    • https://fumaletaseker.weebly.com/uploads/1/3/1/3/131381433/551089.pdfIn PDF document text
    • https://nivumumati.weebly.com/uploads/1/3/4/7/134703955/siripigofojol_pekiwutazidave.pdfIn PDF document text
    • https://tumopododekup.weebly.com/uploads/1/3/2/6/132696021/a4324e5529.pdfIn PDF document text
    • https://dolofironikuz.weebly.com/uploads/1/3/4/5/134588294/labajisizimakuxowizi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lupebesu/nightingale_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/adobe_photoshop_cc_2015_brushes.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/which_is_the_best_cordless_hoover_for_pet_hair.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/59596411145.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/turulerupokasikanibow.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/98738532595.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/folagawadede.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/naporifan.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/nagozigavusofekike.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/whos_afraid_of_virginia_woolf_1966_movie.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E85 5156 bytes
SHA-256: 3a34acdcbb2d1093ab6f386d9637c6059d69c8f90fb2538e319ddbc88afcdd90
font_01_sfnt_off0001300f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300F 3920 bytes
SHA-256: 163737b44df3f7669bfaa201b578d74923f9a01da76f1e425d5dc5ec796b34b0
font_02_sfnt_off00013faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAA 10624 bytes
SHA-256: e80650001f52b021fce0567af8f30377ac09aa8aec4bf9eed415494b643314aa
font_03_sfnt_off00016413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16413 16352 bytes
SHA-256: 867fd276a12397c4e9cf6579dce5e07e5ba80c6769d60c08053fe2abc7b8f701