Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f5767df56afc81…

MALICIOUS

PDF

71.3 KB Created: 2021-03-26 05:05:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 494f50f0000230f9a1b2aad6d67b47ab SHA-1: 7da3bc68b9e85edd191bb9ab39de4a50402056fa SHA-256: 09f5767df56afc81009d1e43d6c39b6cc97ba2e894298d4db240b00891c384ec
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, 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 phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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/award?keyword=developing+skills+for+the+toefl+ibt+intermediate+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412775/normal_5ff64c03207b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419650/normal_5fdfd164a985d.pdfIn PDF document text
    • http://bisibometixo.mywebcommunity.org/what_is_the_length_of_the_5_longest_rivers_in_the_world.pdfIn PDF document text
    • http://xoxosedefoxadu.mygamesonline.org/721446162.pdfIn PDF document text
    • https://dolibaradodusop.weebly.com/uploads/1/3/4/5/134595809/5637079.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385863/normal_6044d27ec7840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424024/normal_601f318ec5286.pdfIn PDF document text
    • https://topasotasakaro.weebly.com/uploads/1/3/0/8/130874498/5422005.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/how_to_get_the_blue_book_value_of_a_car.pdfIn PDF document text
    • https://zetovesejideze.weebly.com/uploads/1/3/1/4/131482946/d6e21b5c9.pdfIn PDF document text
    • https://vusokozederik.weebly.com/uploads/1/3/4/9/134901716/buxorasowifizaline.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/3390ad34-f17a-4965-9664-cb5627761754/u_verse_tv_remote_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9109217d-1895-40ef-bf19-c0e20142b241/63985611088.pdfIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_9353e91b57d74d2a959e1c2f53299faa.pdf?index=trueIn PDF document text
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_e1e4f4ae19c240d0a650cb531081872b.pdf?index=trueIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_2d31cd2223ca443887046b2857e84e23.pdf?index=trueIn 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_off0000d5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D9 5716 bytes
SHA-256: 21b18ea5d6c026f3a9bbb8c3bb07efaa1e2cc0dc8cedea2b26afb0b918ea4c28
font_01_sfnt_off0000e92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92F 11140 bytes
SHA-256: d943ecbd1a16b5f2f193651df33e4f8d3ad32bf95f502648a4cba8763efa257b

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