Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8878caea4d0218…

MALICIOUS

PDF

72.9 KB Created: 2021-04-17 16:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdc0ee9428dd3f164ab0cdeec52a5e0d SHA-1: 27505e3cada6a1685a10699a3bb1d9c943076605 SHA-256: 0d8878caea4d0218f1b0259dddec50c98aa869b5f2f92c8dcb4b5ac9e429a2f0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, 'https://resalured.ru/strik?utm_term=cuales+son+las+palabras+de+enlace+ejemplos', is likely a lure to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://resalured.ru/strik?utm_term=cuales+son+las+palabras+de+enlace+ejemplos
    • https://bigevavez.weebly.com/uploads/1/3/4/0/134016854/2394070.pdf
    • https://cdn-cms.f-static.net/uploads/4422659/normal_603e1fa977ac4.pdf
    • https://cdn.sqhk.co/kunimanujage/didLvgh/ultimate_fishing_simulator_greenland_guide.pdf
    • https://cdn.sqhk.co/goberirud/ngiibjg/xakixamebagiweb.pdf
    • https://fivosegexaf.weebly.com/uploads/1/3/2/6/132683078/4f7219ff.pdf
    • https://jenitexul.weebly.com/uploads/1/3/4/8/134859983/5e0335.pdf
    • https://ponixojezunuto.weebly.com/uploads/1/3/0/9/130969897/tevunupobozo-zisofowab.pdf
    • https://bavanakeburosot.weebly.com/uploads/1/3/5/3/135302165/f1e5709.pdf
    • https://cdn.sqhk.co/rubalibuzodi/iibig1Z/poxomifadaxokibab.pdf
    • https://cdn.sqhk.co/kiribikiv/gejjte0/rusuzamogogawejoxub.pdf
    • https://cdn-cms.f-static.net/uploads/4383688/normal_606b55de60784.pdf
    • https://cdn.sqhk.co/bopibege/gchhhgg/lozejazaked.pdf
    • https://duxixujojive.weebly.com/uploads/1/3/0/7/130739103/7690296.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/figugipopar/vegemurexapupon.pdf
    • https://s3.amazonaws.com/lopadivupudexa/14050487575.pdf
    • https://s3.amazonaws.com/forupokisip/42041842915.pdf
    • https://s3.amazonaws.com/lerezazo/merofuxomobap.pdf
    • https://s3.amazonaws.com/vovabagubajegeb/gusoki.pdf
    • https://s3.amazonaws.com/jupevuxirapi/96622759514.pdf
    • https://s3.amazonaws.com/widetunipet/aashiqui_2_movie_free_in_hd.pdf
    • https://s3.amazonaws.com/tevomenil/46113403309.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_off0000dcb9.bin
5d25eea55ff2c4f26c1a157778ba0e1b53caf8f9b40449bea07812d467330fbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB9 5340 bytes
font_01_sfnt_off0000eebe.bin
3c6df4bb83d897f8c6f498a6532585d46709110c48c459bdf4756c8dc5310a1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBE 11696 bytes

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