Malicious PDF — malware analysis report

Static analysis result for SHA-256 f313bdee740165f8…

MALICIOUS

PDF

82.3 KB Created: 2021-05-27 08:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6e8dbe92e6e719586aaf7d92541e1c22 SHA-1: aff09a084ba85aa15730113313001a3f724dc017 SHA-256: f313bdee740165f8afedf2852ab02f8cb159982f0757ff39144b6c1970695758
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://nipisod.ru/strik?utm_term=swtor+guild+stronghold+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485436/normal_5ff78ec3af398.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456119/normal_602aa97bcb734.pdfIn PDF document text
    • https://sipitajopidegol.weebly.com/uploads/1/3/1/4/131453448/xepuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391920/normal_6065952204e97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386081/normal_5fcd45eeba16d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380858/normal_6038c53c3b01f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455669/normal_60143d8ba08be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403414/normal_604014b6c30c7.pdfIn PDF document text
    • https://venivuwaw.weebly.com/uploads/1/3/5/3/135308653/nugamegenenoku.pdfIn PDF document text
    • https://niwurakoj.weebly.com/uploads/1/3/4/5/134588258/7639544.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420034/normal_606baab992e0c.pdfIn PDF document text
    • https://vavonezutama.weebly.com/uploads/1/3/0/8/130814168/e1ed3.pdfIn PDF document text
    • https://dimomivij.weebly.com/uploads/1/3/4/5/134504604/ddfa746c88f9be.pdfIn PDF document text
    • https://nivavige.weebly.com/uploads/1/3/0/7/130739715/zapifik_worode.pdfIn PDF document text
    • https://fukagopesuzidad.weebly.com/uploads/1/3/1/3/131381553/6323183.pdfIn PDF document text
    • https://mewupigokudupez.weebly.com/uploads/1/3/0/7/130738506/xolimupuv.pdfIn PDF document text
    • https://gafukarufigak.weebly.com/uploads/1/3/5/3/135309608/6073797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411228/normal_606c918c5bf3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483335/normal_605d7fbb18340.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379731/normal_60065aa26f65d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366949/normal_5ff18faa5e59f.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/64b504d4-5c03-4a55-ba40-9a0dd82da6e2/68763156997.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47e937d2-897b-4c9b-98a4-0a97906e4011/84922415377.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cbe7cb9-c4ee-4d28-ac40-054833ccb6f6/5678822917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7e8773e-b14e-44e8-8433-4a0aa6ebd531/17433329157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d764c189-6d6a-48b1-aaca-c6255bbe87fd/jurigidazepuji.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_off000103e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E7 5072 bytes
SHA-256: 9d70db3d86c9fcd71f8e291bee396c7bd0626df31d16305bf6414d3a4561a8da
font_01_sfnt_off00011531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11531 11272 bytes
SHA-256: 6e514ab1772ffcedd4bac63103ef1ed4a018da941fa1c641aa09469d5033ee85