Malicious PDF — malware analysis report

Static analysis result for SHA-256 09686bc8a4185ea8…

MALICIOUS

PDF

75.3 KB Created: 2021-04-01 14:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9b708c1b93111000f32814e82cff479 SHA-1: 2c298aaba8def671c89e3c9e0c216d6cb2e941d0 SHA-256: 09686bc8a4185ea8f3e691c262372097b68d9152468813275a9ecc7913571dae
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or distribution mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classified as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to potentially harmful sites.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/123?utm_term=rogue+lockpicking+leveling+guide
    • https://cdn.sqhk.co/givujelised/eIjfhcx/adjectifs_qualificatifs_fle.pdf
    • http://fazejajogavu.medianewsonline.com/9873629802.pdf
    • https://ragesetenavuxom.weebly.com/uploads/1/3/1/6/131606186/mafol_ragexi_tivirapew.pdf
    • https://cdn.sqhk.co/maxevurux/bheNPoX/pimamumepoda.pdf
    • https://sulesebu.weebly.com/uploads/1/3/4/6/134634805/jibunixulad_xabovus.pdf
    • https://pimusaxasoj.weebly.com/uploads/1/3/1/8/131856122/xonutupudam.pdf
    • https://losewilim.weebly.com/uploads/1/3/4/8/134854933/a15c5a6d.pdf
    • http://saporik.scienceontheweb.net/gixirerev.pdf
    • https://cdn.sqhk.co/wevamerazo/kbijHhh/zojejuzegunefinubes.pdf
    • https://cdn.sqhk.co/govamopega/jhfgcge/zeweminuro.pdf
    • http://zusazibob.iblogger.org/badminton_court_size_in_feet_with_picture.pdf
    • https://sovurides.weebly.com/uploads/1/3/5/3/135349611/xamajuto_vudal_vorovun_karazoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/011d3bba-ffb6-4a45-a28c-eb265606f40f/how_long_is_marine_sniper_training.pdf
    • https://uploads.strikinglycdn.com/files/fcd39bfa-69b3-428a-b442-a021c1d5b204/18885448851.pdf
    • http://zipokuxabatu.rf.gd/fusionner_deux_pages_mac.pdf
    • https://uploads.strikinglycdn.com/files/1506904d-ae36-42dd-bc50-9faec44d88b5/al_quran_digital_online_malaysia.pdf
    • https://uploads.strikinglycdn.com/files/620d678f-7d06-4a2d-afbb-1698630d4b4b/operations_management_mcgraw-hill_series_in_operations_and_decision_sciences_12th_edition.pdf
    • http://jawafezirosozo.epizy.com/tactics_for_listening_developing_tapescript.pdf
    • https://uploads.strikinglycdn.com/files/b8935c76-dae9-4286-aa5b-160fbc6f106c/povebitetugem.pdf
    • https://uploads.strikinglycdn.com/files/b37adcbf-d66a-4ee7-af36-2d3ee0b179d7/how_to_connect_ps3_bd_remote_control.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_off0000eae3.bin
8a21910e810e144ab1cde3c30e5a2d0bf7f7798eb528d7c22f11b5fbe3d89c43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE3 4888 bytes
font_01_sfnt_off0000fbb0.bin
b8c152c044db405d08fff28a34f4db77e3b79ae2947f9a4794c4556b6a6500e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB0 10648 bytes

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