Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c2b85a2fdb3eac…

MALICIOUS

PDF

85.6 KB Created: 2021-03-29 18:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a5b2f30fb4f6083ecb46511746da5bc SHA-1: 5083fbd49c17770ff12fa7d314d8c0edc675c514 SHA-256: a4c2b85a2fdb3eac0681e144dafccda59a7bd02a4029e81d91a4cbe4cd069c04
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm designed to direct users to other sites. The primary malicious URL identified is zajinet.ru, which is likely used for phishing or to serve further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=how+many+sq+ft+will+a+pellet+stove+heat
    • https://lewonodi.weebly.com/uploads/1/3/4/3/134330754/710181976.pdf
    • https://cdn-cms.f-static.net/uploads/4366028/normal_6044ce4a74436.pdf
    • https://fumitalabojaluk.weebly.com/uploads/1/3/5/3/135399187/perun.pdf
    • https://static.s123-cdn-static.com/uploads/4393362/normal_600149d38cc3b.pdf
    • https://cdn-cms.f-static.net/uploads/4476142/normal_6058afe99859f.pdf
    • https://cdn-cms.f-static.net/uploads/4450519/normal_60316e23a5b1a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/6d5d5921-5e4c-4b59-b1b9-af2d34b96810/mefobesobukinaxowi.pdf
    • https://uploads.strikinglycdn.com/files/1081f81a-f6de-4656-8711-3823e14e6b96/tujulebafugewubadigudu.pdf
    • https://uploads.strikinglycdn.com/files/677e7f02-1ad4-4c95-a38b-d3e374491461/audio_cdl_driver_manual.pdf
    • https://uploads.strikinglycdn.com/files/43ddef73-4a4f-46f1-9de6-ff521c912f6b/what_is_the_federalist_70_about.pdf
    • https://uploads.strikinglycdn.com/files/9c4d2fd5-b3ed-474f-891d-74304a4b895b/books_written_in_1900.pdf
    • https://uploads.strikinglycdn.com/files/f5e15e3e-90d6-4836-8d71-524d06901b57/38628016328.pdf
    • https://uploads.strikinglycdn.com/files/06bb596f-d250-4df8-a08b-7304708352d3/who_makes_simpson_power_washer_engines.pdf
    • https://uploads.strikinglycdn.com/files/da6ef1d0-6e86-4c43-bcb0-47ed862d2638/how_to_remove_schlage_electronic_deadbolt.pdf
    • https://uploads.strikinglycdn.com/files/f576cf17-0539-4b50-914f-e3e4d9599f61/80190843181.pdf
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_d08b82e98d754b3487ca6c6f8c247255.pdf?index=true
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_9283f3015bdc46a38edf2a9eefd6f166.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2cf09e37-1bfe-4a1a-9d03-8eb0d133b471/who_owns_the_ice_house_quotes.pdf
    • https://uploads.strikinglycdn.com/files/0eaee852-f314-492a-8b47-91ed2425e952/influence_without_authority_training_courses.pdf
    • https://uploads.strikinglycdn.com/files/7f965138-4534-4dc2-aa9b-b8c7344c4aa6/57758236509.pdf
    • https://uploads.strikinglycdn.com/files/0cc92278-51a1-4c1d-a036-9bc56221e428/honda_pilot_maintenance_codes_b1.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_off000103c1.bin
1aa163331ffd973fbfb5fb27ea01abda456a13ea75bf10989690b4b187b9be13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103C1 5172 bytes
font_01_sfnt_off00011544.bin
a1c1952aaaa4bf551718e9324a8ba8b48bd5ba00c7ab33960ac6aa011e9c0b4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11544 10948 bytes
font_02_sfnt_off00013a7f.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7F 4324 bytes

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