Malicious PDF — malware analysis report

Static analysis result for SHA-256 41601deefbef2d81…

MALICIOUS

PDF

82.2 KB Created: 2021-04-23 17:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9f805f15be28c2ead1baec8fad29bc7c SHA-1: 92977c9d51d14991c0810e50cd081be13a0faf27 SHA-256: 41601deefbef2d81b8611c48f52e92f697edcb6c7781bbaae3c3f357d45f686a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and utilizing UTM parameters, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are commonly associated with malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pelibifir.ru/strik?utm_term=what+is+weighted+graph+data+structure PDF link annotation
    • https://cdn.sqhk.co/kuwusemob/kijchgo/visolonos.pdfIn PDF document text
    • http://mujuwowewo.22web.org/73247119741.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489615/normal_60635d394c1fa.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/YjiyheI/worx_18_chainsaw_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/bepifopid/Rdxgeii/kebenezife.pdfIn PDF document text
    • https://cdn.sqhk.co/rosafipex/tjgy7ub/rojamovuvaruli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448985/normal_604463a769a11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379359/normal_5ff034605e424.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378613/normal_5ffa39e125fc1.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/gnOo533/smithfield_spiral_ham_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447265/normal_5fd398ae8cdac.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/5c90ccad-4615-42a0-a382-d3f100a75be5/dadenazef.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/74531318406.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/winubofavibuz.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/autocad_plant_3d_brochure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd258570-4032-461b-9a9f-b8362f27da3b/software_engineering_services_bellevue_ne.pdfIn PDF document text
    • http://pozifaganepele.epizy.com/fimas.pdfIn PDF document text
    • http://vumafovixono.rf.gd/employee_contract_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/android_tablet_emulator_for_pc_free.pdfIn PDF document text
    • http://lijezuzoxej.epizy.com/sodastream_canister_refill.pdfIn PDF document text
    • http://garubokiboja.rf.gd/90830879255.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/katod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a724227-7f55-4540-b358-4b2883b0390a/3605664442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ffaa067-0f25-4785-ae63-1279a4b63487/how_many_copies_did_diablo_3_sell.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 5408 bytes
SHA-256: 85aaa7fa8e9babd8cb8b7222a0cea20c8e1d01be52deb79b7d1a1858adc5f55a
font_01_sfnt_off00010908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10908 1940 bytes
SHA-256: 5b0e6fd9aa06054e8a90361113ac7715cc4c8db9fbb87c84f0adbc1de0cb15e7
font_02_sfnt_off0001123c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123C 11344 bytes
SHA-256: 3fbb61e3c6fa344751519b2b4f715c0dded28c1d980036347d843eca0b85d7ab

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