Malicious PDF — malware analysis report

Static analysis result for SHA-256 60fac54a7b1873bb…

MALICIOUS

PDF

80.2 KB Created: 2021-05-20 16:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 301358319e806bdeeeda233909cbdb2a SHA-1: 2aa80d6b4fa72fd7e81bb29b668c1339e781017d SHA-256: 60fac54a7b1873bbf794da4a853a5cf932ba38024e861ac0eff164cabc5913fe
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO abuse tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URL and the document body, which poses a chemistry-related question, are likely lures to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://bologen.ru/strik?utm_term=why+does+colour+of+kmno4+disappear+when+oxalic+acid PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446390/normal_603e877b6286c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478137/normal_606b4cf512d9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424991/normal_601bfad0e7622.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449183/normal_5ffb8a2b35d59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458394/normal_604f52efc0b59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385876/normal_6022b1b82cb54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416654/normal_60119ad5580ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366385/normal_6049ecf17938b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368972/normal_606e1e8de5790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476941/normal_601fc36e986e0.pdfIn PDF document text
    • https://nokuzase.weebly.com/uploads/1/3/4/7/134765685/nitajudiw-lakigipifipo-jofusufuwesova-tujif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460688/normal_5feefc16da5e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472503/normal_5fdf4d47d713f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410954/normal_602b70a156e8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501659/normal_6011e2986abfa.pdfIn PDF document text
    • https://tirusagoxavux.weebly.com/uploads/1/3/5/3/135329940/a90ca776b787908.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_60188d60268d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/317b6f46-f012-47b8-8238-918c8afc1c9a/pride_and_prejudice_and_zombies_2_full_movie_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a425c52-9dd7-4d46-b951-85f5acc98677/cub_cadet_1045_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/216ffc01-cc25-4c44-aeed-525cc19dcd13/40597407535.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89236923-8cbf-4634-8ac8-a7a3e6264949/hp_officejet_pro_6830_not_printing_black_ink.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bba7fa0-6b43-4810-82e6-676fae543131/mirirelibiboz.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 5820 bytes
SHA-256: 5369bc062667b5a2e7bced47db9f63a5f68cedac72107b52a541109d5fc410b3
font_01_sfnt_off000107ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 13712 bytes
SHA-256: 1f9876353902b074d12cc643120d00593a22b960ec8d26717510722eabdc4a29

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