Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e704a3543c266a8…

MALICIOUS

PDF

78.2 KB Created: 2021-03-25 03:10:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 693e2da32dd2f9301eb97b83fb74cb6e SHA-1: 505d3b9d990e6d73b1a133c6bc85618fb1577ec5 SHA-256: 9e704a3543c266a87115a4ef77f508f4e2573039847163aa6ac0c4b5a1ce158c
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 pointing to disposable hosting, indicating a link farm or SEO manipulation attempt. ClamAV and ML classifiers flagged the PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=quotient+rule+derivative+worksheet PDF link annotation
    • http://pawusewi.sportsontheweb.net/kewevodolupetoxomi.pdfIn PDF document text
    • http://nofubajabuv.medianewsonline.com/nutenudonibakopodiwus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b1f0a730-f0e4-4bcf-918d-a915077b90d0.filesusr.com/ugd/a7c69d_af4781515b0a4cce9222f2e6fb476824.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/49387420899.pdfIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_1af4734303914b2a824dda51d78f51a9.pdf?index=trueIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_1626726f88914d77a707d5d0a406055e.pdf?index=trueIn PDF document text
    • https://781b76d0-895c-4d4e-90f3-491762fad171.filesusr.com/ugd/894952_5f646ad395364672bcd25c34d81bb62b.pdf?index=trueIn PDF document text
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_3387353690bf479bbc87c64543687cd3.pdf?index=trueIn PDF document text
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_0d24606b254d4fde88f30b9d562c012c.pdf?index=trueIn PDF document text
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_f8cc3b2d0c7e4d69b347d3400120c6f2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/23b1c16d-67f1-4fd2-afef-631418f4dd2e/en_la_ardiente_oscuridad_resumen.pdfIn PDF document text
    • https://87098103-4d08-48bb-90a6-807b0ef734b2.filesusr.com/ugd/1f49de_3a83a1e6a3b54d80b2d28b4b64897a91.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0be2fe78-8440-4c77-88d4-b8492a4feb72/butojexafotafapotoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d9f30b7-3006-49c5-b8be-e337d5ff8fb8/48786754259.pdfIn PDF document text
    • http://jeximojela.myartsonline.com/46325881474.pdfIn PDF document text
    • https://3064a0a7-8496-4b95-be1e-56094aee372f.filesusr.com/ugd/0cf4b9_cde45ecb7f344653b42af1f5a035e85b.pdf?index=trueIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_49ca1af974054b06bb6b92a72074978b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juduk/wuzaxomixamok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af6ec755-6c53-43d7-8732-9b3579e50f9d/42197527303.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_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 5188 bytes
SHA-256: fa355b9b3570946842301a3f379d245306ca7b17e07d773de0bbb4ffca8b9668
font_01_sfnt_off000103e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E9 11672 bytes
SHA-256: 4fd7c75b124f1acb4e151963af6f83967721c2f1b61238918e9d8d414095bc88