Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cbf08a0be744cc…

MALICIOUS

PDF

75.4 KB Created: 2021-04-22 03:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 459a42c136dc06b86366f01c402dab11 SHA-1: eb16136fb8e002b9e5a42cb25483bdbe0dfa8398 SHA-256: 51cbf08a0be744cc7b6a73b413ace32e42ab9b484ae6f8069a505977f6b8253b
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 potentially malicious or SEO-spam sites, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier also flag this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the presence of numerous external links suggests an intent to redirect users to malicious content, likely for phishing or further malware delivery.

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://botokaw.ru/strik?utm_term=magic+deck+building+tips
    • http://zofunubesosena.mypressonline.com/bafapukimewejabawojivo.pdf
    • https://gikesusemu.weebly.com/uploads/1/3/4/7/134775173/5721911.pdf
    • https://tapukupe.weebly.com/uploads/1/3/4/7/134717462/nitemimojusamunixad.pdf
    • http://fobexugelego.getenjoyment.net/arduino_nano_pinout.pdf
    • https://nulodikoz.weebly.com/uploads/1/3/2/7/132740439/dfb6c17.pdf
    • http://wejuzofibab.medianewsonline.com/wrist_joint_anatomy.pdf
    • https://zubisixoligifi.weebly.com/uploads/1/3/4/4/134479514/bujexasurojodelina.pdf
    • http://tututot.mygamesonline.org/el_bienestar_animal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/11f69fe9-de06-4286-a9fc-911ebf726af5/37712803089.pdf
    • https://s3.amazonaws.com/bitizopovopaso/45586354043.pdf
    • https://s3.amazonaws.com/gumegulaxi/craftsman_electric_blower_vac_manual.pdf
    • https://s3.amazonaws.com/zedudo/tatag.pdf
    • http://dalitixusukewo.epizy.com/castle_crashers_pet_guide.pdf
    • https://s3.amazonaws.com/jevelel/79754237848.pdf
    • https://s3.amazonaws.com/libowebujakux/what_day_is_christmas_on_the_julian_calendar.pdf
    • https://uploads.strikinglycdn.com/files/cca4443e-12a4-4e6a-a1ad-6ecc8f6a7f30/sagifiponegorize.pdf
    • https://uploads.strikinglycdn.com/files/b25d6442-ef27-48a9-94c6-28f730bb167c/how_to_use_omron_bp_cuff.pdf
    • http://peromur.epizy.com/what_is_urban_community.pdf
    • http://forojiwimudobo.atwebpages.com/alcohol_abstinence_syndrome.pdf
    • https://s3.amazonaws.com/benubapopikaj/rejabima.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_off0000e8f8.bin
b8bc631db9598755c585890d89195b9bb1e897cb60efcc15bb5d556cab05a2ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 5352 bytes
font_01_sfnt_off0000fb4c.bin
cc29f4c0dcdd2316c4a3b944f7be6a452a8379f2d1eff90c747b6df1f1c78136		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4C 10992 bytes

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