Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba946ecd88623f1f…

MALICIOUS

PDF

86.8 KB Created: 2021-04-17 00:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d30a7ed6aa18f8596a53d929e0773ccf SHA-1: ebc1c8d1d3f48f4bfe5fbedd9406e76aef160b42 SHA-256: ba946ecd88623f1fa012736ae2610bf35439ee248eeb2b6b95b58bff6f321bae
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to direct users to potentially harmful external resources.

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=como+hacer+un+estudio+de+caso+en+psicologia+clinica
    • http://bluebadgeform.com/jilodafijelovuwekumufal4ip4t.pdf
    • http://prizinsta24.space/sonic_adventure_dx_metal_sonic_storysudv3.pdf
    • https://bobelijanufav.weebly.com/uploads/1/3/5/9/135960041/sonuvuxoja-sixom-pijitilog.pdf
    • http://laura-egorova.ru/xemunomyvsal.pdf
    • http://nonly.xyz/63698864394lf7k0.pdf
    • https://tugofemupufere.weebly.com/uploads/1/3/4/5/134584107/6586619ef3356e.pdf
    • http://instapriz365.online/nevesuzafomogokeburz4yel.pdf
    • http://smartcoin.design/15111380834qzu2.pdf
    • http://theplafond.xyz/gikorivepepuvuferafaborb96et.pdf
    • http://begetus11ppz.xyz/should_you_skip_rope_everydayqfpeo.pdf
    • http://thrivewebs.com/nabatabegamuretm37.pdf
    • http://skidki-day.shop/best_topical_bible_study_guide68r1j.pdf
    • https://bapanezuginu.weebly.com/uploads/1/3/5/3/135310050/dbd3b4f.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d0751a79-55d5-4026-a66a-c258a094bae6/dufajulaworifiworukizuk.pdf
    • https://uploads.strikinglycdn.com/files/1833739f-3695-4a6c-8d53-e8e06ae579e2/warhammer_fantasy_8th_ed_rulebook.pdf
    • https://uploads.strikinglycdn.com/files/363d6fb3-4fd8-4f31-915e-7157ce44c27a/starcraft_rv_mossy_oak_lite_20bhs.pdf
    • https://uploads.strikinglycdn.com/files/59c0acd4-e9a4-438e-83e6-154b33354b3b/lawum.pdf
    • https://uploads.strikinglycdn.com/files/f3e67088-eadf-49f1-988b-b41afcac5dd2/monster_girl_doctor_episode_12_sub.pdf
    • https://uploads.strikinglycdn.com/files/ca3937b6-b0d8-4e81-9dda-1df7dd1ee255/forgotten_realms_novels_chronological_order.pdf
    • https://uploads.strikinglycdn.com/files/943ddfb2-18c0-447d-a738-fb09bb809764/bojidobuzevonuviwofifira.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b4a.bin
7a1e77d6919eddf1b54d2fd4eb51e97cce499a4e7f0788cb58ab1911d0139b4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4A 1944 bytes
font_01_sfnt_off00011480.bin
5aef965d29bae79249e8b117ba50ce7a990da84030dc4a0fc28baf3915375b68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11480 5392 bytes
font_02_sfnt_off000126a1.bin
c941988f47535fb55edafd45e2362d0d9118b759239728d9d7a4114d1e423ed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126A1 12092 bytes

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