Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff073186ddb921b4…

MALICIOUS

PDF

66.6 KB Created: 2021-05-28 18:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bb0faa43646aac66d5f53ff6e901e433 SHA-1: 7d97c2fc1d3245160a6ba2aa2d3c2ae7980ad2f4 SHA-256: ff073186ddb921b45694f49761e29bdc0d65ccce577e7ec35f3c86f25e4bab6e
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, including one that appears to be a phishing lure disguised as an answer key. The presence of embedded external links suggests an attempt to drive traffic to potentially malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/strik?utm_term=grasshopper+anatomy+and+dissection+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379606/normal_606854693faad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446781/normal_602ab1b57f6ae.pdfIn PDF document text
    • https://lobalose.weebly.com/uploads/1/3/6/0/136089755/5493939.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/22f59c8cacec724.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381740/normal_603184ec94061.pdfIn PDF document text
    • https://gotanizanoga.weebly.com/uploads/1/3/5/3/135332446/d3085186b771913.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387706/normal_5ff7ffe7bc2b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378621/normal_5fd7d5cc904b7.pdfIn PDF document text
    • https://nuzewotamomumaf.weebly.com/uploads/1/3/4/7/134701518/b8e3c9f6f098.pdfIn PDF document text
    • https://pigofularujatuf.weebly.com/uploads/1/3/4/3/134360020/1248848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471109/normal_601a406f5b72f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450439/normal_6068ce87b1a79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480749/normal_6010d8dc008e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421623/normal_60102d7ae8e95.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/05c53c7e-c1e1-46b0-b2a4-7c77d00db8c6/is_ccna_worth_it_quora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2cf1f13-3fef-4ee1-8737-cd77f8785989/90182876819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6d49504-1f84-4ef7-bc1e-086a5281188c/sadlier_vocabulary_workshop_level_e_answers_unit_14.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99d7c311-4c1b-4754-a333-d912dbd3f603/rigejano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23265890-e540-419e-9f56-3db8ab67b821/25055282312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a53b62-8cce-4a9f-831c-64e4cdb78ee6/hp_pavilion_dv6_bios_reset_jumpers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e1078d8-23b9-4b7f-a54b-531c7c1cc56b/wojewozojuv.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_off0000c75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75A 5568 bytes
SHA-256: 8486e69d8624c1a2b92fa340480b01475abe87cfdaa0bc3a761e18d871804344
font_01_sfnt_off0000da3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3B 10140 bytes
SHA-256: 40a306cc8d8585914cf2469180e4e51b3a52cf6792ccc769add28e5f0660ad6d