Malicious PDF — malware analysis report

Static analysis result for SHA-256 477c627aca1143f8…

MALICIOUS

PDF

92.4 KB Created: 2021-04-01 18:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43e2c75cf6e355c75aa3197be34eaf57 SHA-1: 92f9af82853287a633c6f85f9934a8dd34087f3f SHA-256: 477c627aca1143f8d6588f99414f79436f1a389e0f8526f5c63754e6a75eb664
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, with the ClamAV signature pointing towards a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://ponafet.ru/strik?utm_term=in+cold+blood+truman+capote+summary
    • https://bipejazikapidim.weebly.com/uploads/1/3/4/5/134529651/7384947.pdf
    • https://static.s123-cdn-static.com/uploads/4481423/normal_5febd05b229ce.pdf
    • https://litefobobufi.weebly.com/uploads/1/3/5/3/135326689/ca4c52046.pdf
    • https://static.s123-cdn-static.com/uploads/4471256/normal_600146f33403e.pdf
    • https://kodavagimiwebod.weebly.com/uploads/1/3/5/3/135346487/xejelikijamemep.pdf
    • https://tupusedaluniji.weebly.com/uploads/1/3/0/7/130738871/lovojemekataso.pdf
    • https://cdn-cms.f-static.net/uploads/4368226/normal_5fd962a7332bd.pdf
    • https://cdn-cms.f-static.net/uploads/4481852/normal_605fd91bda8e4.pdf
    • https://static.s123-cdn-static.com/uploads/4406455/normal_5feef2586c33d.pdf
    • https://cdn-cms.f-static.net/uploads/4389821/normal_6025a87d892ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1107d7b1-1458-4f03-87ee-007b9cf11969/what_is_a_physiological_assessment.pdf
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_247070f1e8254a5bbf3fd449688c962e.pdf?index=true
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_fe2398067b704f599d2bd2449cdecc9a.pdf?index=true
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_d945a92d04a04b27a244f58c36e8fc43.pdf?index=true
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_f26eaf5256ad4c7582572ba5eae222b4.pdf?index=true
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_81b31adacf8446f79976658db0cf1727.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a1296799-1321-4353-a2b4-ceb33051993c/where_are_ephemeral_streams_most_common.pdf
    • https://uploads.strikinglycdn.com/files/1e489702-7dcf-4e05-8a00-9bc7c39ef17a/gopasufemiguxatavovola.pdf
    • https://uploads.strikinglycdn.com/files/a9e884a7-9959-4c1e-9a96-c97caaa1770a/select_the_next_number_in_the_series_16_26_21.pdf
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_817b412536754ad5988ae312f664c4bf.pdf?index=true
    • 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_off00012af3.bin
f8fd97401dcbc9999657317521f1ef64937f7cf94c0ae35ea894f8d3de876373		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF3 5400 bytes
font_01_sfnt_off00013d34.bin
d811a3a7b318881661bd93e0f14afc15ad90ac33424bafa5bb0be295271ee06d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D34 11608 bytes

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