Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3c0aba478a7d85…

MALICIOUS

PDF

75.3 KB Created: 2021-03-31 07:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a574c81a4ef71ca2efda6345f2c286e SHA-1: 8da6be1cd4e51b05bcef7ef86da056f8d3df9a0d SHA-256: 8d3c0aba478a7d8515479de7135c893070e65a5764d5f7332f7196a15f9a5f80
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xezojetit.ru/strik?utm_term=what+are+the+4+elements+of+a+computer+system
    • https://static.s123-cdn-static.com/uploads/4486763/normal_5fddc30e9abde.pdf
    • https://cdn.sqhk.co/xubewarow/Njchiij/88232846327.pdf
    • https://cdn-cms.f-static.net/uploads/4374852/normal_5fe6abfc0c8e1.pdf
    • http://fesotisifofil.mygamesonline.org/how_to_use_proctor_silex_coffee_machine.pdf
    • https://cdn.sqhk.co/bosesegivu/YiaiivD/football_predictions_soccervista.pdf
    • https://cdn-cms.f-static.net/uploads/4414680/normal_6041c443cbfd3.pdf
    • https://static.s123-cdn-static.com/uploads/4366401/normal_5fe23e5a7ab6b.pdf
    • http://gomijexa.mywebcommunity.org/betejukapesivekidi.pdf
    • http://kinemulawaw.sportsontheweb.net/wosokugoxitamanoko.pdf
    • http://vibolofisef.mywebcommunity.org/bayesian_algorithm.pdf
    • http://wirobigi.medianewsonline.com/xegenol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_34df45a135c34bc8aba1d395b50600ce.pdf?index=true
    • https://0c43c058-97b3-435a-b041-a9f001bfa883.filesusr.com/ugd/791d74_af368d2f7bbb498a8562822fb442e10b.pdf?index=true
    • https://s3.amazonaws.com/bubeto/bidutupibajelugokafivir.pdf
    • https://s3.amazonaws.com/teximikamukubo/westinghouse_microwave_model_wst3501.pdf
    • https://5ee0d2ad-6486-47ce-ab7d-0e7b2bae4193.filesusr.com/ugd/bc0d1e_884ff3a4e97e4c6395fccb901a35a776.pdf?index=true
    • https://2559d30b-64cd-4b4d-aaad-e76a675dde99.filesusr.com/ugd/f5a024_e0a881e6e9ce4bb988e3a818d6dcda47.pdf?index=true
    • https://s3.amazonaws.com/nonabafat/45235246661.pdf
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_12c284deceb3442d96fc875086a632ca.pdf?index=true
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_82227592f2404889ae7f0d7e9c6eae8d.pdf?index=true
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_7849071978f44813b929b418ef1480f2.pdf?index=true
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_4474bf64c4f644a4bc8ef576246dab07.pdf?index=true
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_95fb0f508e5b489884f161df25d9edd2.pdf?index=true
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_4658a719756b481db1dbfe162b61d51b.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_off0000e77f.bin
b5ef335c27462a1b443d497d8fb6d697a25c6e413565d6ae01e84706e86b38e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 5456 bytes
font_01_sfnt_off0000fa00.bin
8c79cdf6542d4aefc69392340c0fc9876a030ee7d5c512071cb71b0d53774b31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA00 10844 bytes

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