Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e3c8d6a2b8b989…

MALICIOUS

PDF

78.0 KB Created: 2021-04-30 03:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e31ddc8b60063d986b78d12728053b4f SHA-1: 7e7ec94b3da14a53ed9568b17495468cdc6f2067 SHA-256: b6e3c8d6a2b8b989ad060508fe9253c1a76a8fce3c59871839c23fc10a4c6dfd
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 designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/strik?utm_term=think+like+a+freak+summary PDF link annotation
    • https://xokefinodoju.weebly.com/uploads/1/3/5/3/135316617/5580821.pdfIn PDF document text
    • https://biwobere.weebly.com/uploads/1/3/4/3/134372714/8747518.pdfIn PDF document text
    • https://kogofidovobe.weebly.com/uploads/1/3/1/8/131871531/tabuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412774/normal_60446c5c97023.pdfIn PDF document text
    • https://waguxezemi.weebly.com/uploads/1/3/4/7/134703223/nifigig-keradu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469631/normal_602885417043e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489838/normal_5fe83f92ddf0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488335/normal_60613321db705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409997/normal_60635aff7733a.pdfIn PDF document text
    • http://gejopuzebizovuk.iblogger.org/danetapekevefuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379848/normal_60353dfe81601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409619/normal_6065c192da75a.pdfIn PDF document text
    • https://bewobuvepo.weebly.com/uploads/1/3/2/6/132695749/6782bcbb00aed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413369/normal_60092a457e0a5.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/75965f96-0f0b-4190-879c-545315aa1ada/27490762420.pdfIn PDF document text
    • http://vixekufu.epizy.com/19338170712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30adbcd8-a11e-4ebf-ac48-86d65bf4eedd/37168805966.pdfIn PDF document text
    • http://juviwutifazav.rf.gd/mosokosikeme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1e3c92f-b390-48e9-9aa3-1f57d7b65217/83183838697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/198bf708-383f-430a-9413-dcfee1d191f3/20988110701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5289addf-3ea9-41fb-9887-3c0d88bb7883/64353664193.pdfIn PDF document text
    • http://puribobelumisi.rf.gd/linking_verbs_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17939637-73ca-4de5-b9e3-21447525b56b/69003856937.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 5120 bytes
SHA-256: d6bb3574d588c4678962e27859ead511e61b40382a3c245bd60ad20111d1b111
font_01_sfnt_off00010500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10500 11060 bytes
SHA-256: cb0286386623c1948629e71e4d27e5112c7cf46c042d8cec8beaaf7bef249772