Malicious PDF — malware analysis report

Static analysis result for SHA-256 9045897c4eec1459…

MALICIOUS

PDF

77.6 KB Created: 2021-03-24 04:54:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6414952ea0ad4339e0b65e9d1ec07657 SHA-1: 77e3eead936a6d5e2f47f6a51c0f4579e2c56b86 SHA-256: 9045897c4eec14593a38909b7bbc9770ef14047274102ee36d1d45895a9a43aa
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary IOC is the URL 'https://jacksth.ru/strik?utm_term=freelance+graphic+designer+jobs+near+me', which is likely used to initiate a phishing or malware download chain.

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://jacksth.ru/strik?utm_term=freelance+graphic+designer+jobs+near+me PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449181/normal_6056565922e3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407299/normal_5fe953e275473.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369522/normal_5fced65cc092d.pdfIn PDF document text
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/muxigoxuzonubun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465907/normal_603155cea934e.pdfIn PDF document text
    • https://rexajubimazon.weebly.com/uploads/1/3/4/8/134884463/6198489.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421471/normal_5fd96de43318f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475741/normal_60272ed33973c.pdfIn PDF document text
    • https://mosevulex.weebly.com/uploads/1/3/4/8/134860143/dowitirimir_zutigamawizogup_zajoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446634/normal_6004e7124132b.pdfIn PDF document text
    • https://fegemuvu.weebly.com/uploads/1/3/2/6/132695633/rodewa.pdfIn PDF document text
    • https://najilemizosi.weebly.com/uploads/1/3/4/7/134730194/3387597.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483103/normal_6000f05bc524e.pdfIn PDF document text
    • https://purapunebofo.weebly.com/uploads/1/3/4/8/134888030/7446329.pdfIn PDF document text
    • https://gazekusiparisom.weebly.com/uploads/1/3/4/0/134012522/e8655.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/fulelexi.pdfIn PDF document text
    • https://331e17ce-4321-42a7-89aa-067eaa3daeeb.filesusr.com/ugd/6576ad_35ac07176f48414eb553061b9256ccba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tulosa/gizupagobenirixera.pdfIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_b82d4a47cec8487fbd0b64661ddc8b58.pdf?index=trueIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_eaea12ef3e1c453394e23e9ed0781c13.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_off0000f1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 5660 bytes
SHA-256: 7441b9c992713ddbd4e848e05e445a3d6fd56c2b80f0572dfffbd2c2d7497709
font_01_sfnt_off000104eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EB 10536 bytes
SHA-256: f9131ccd237d1f15c5f4f867434097fa3bdef317ec2122e6a11a6ed318ee03ea

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