Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fdff0db777a49d2…

MALICIOUS

PDF

69.4 KB Created: 2021-03-09 01:16:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ba5a3934694958307eb64915cb102732 SHA-1: 51429dddb0b768a3822be8f36d9fb608d38ed2cf SHA-256: 6fdff0db777a49d21a4255d0b760480b7e5742a79a88c7e3d1e3d48d51b84b5f
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. One of the embedded URLs, 'https://soxebez.ru/award?keyword=yasin+pdf+jakim', is particularly suspicious and likely leads to a phishing or malware distribution site. No scripts were extracted, but the PDF structure and link farm behavior are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=yasin+pdf+jakim PDF link annotation
    • https://kejojotevunujip.weebly.com/uploads/1/3/1/8/131871587/juxalibukofe.pdfIn PDF document text
    • https://jorosavuzeloda.weebly.com/uploads/1/3/4/7/134755790/44e8818d5ac32.pdfIn PDF document text
    • https://teregurejojexol.weebly.com/uploads/1/3/4/8/134879353/kegifug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463809/normal_5fe7708c4c412.pdfIn PDF document text
    • https://xafituku.weebly.com/uploads/1/3/4/8/134863640/maxos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403947/normal_5fc69dd7df4b4.pdfIn PDF document text
    • https://lerorenoj.weebly.com/uploads/1/3/5/3/135390996/aa166cc075fef9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446158/normal_5fe255e2242f0.pdfIn PDF document text
    • https://mopelajizefuxo.weebly.com/uploads/1/3/0/7/130739073/48a42c38a32d99.pdfIn PDF document text
    • https://kozuliwibiji.weebly.com/uploads/1/3/4/7/134705154/pepife_lixuxotutomaw.pdfIn PDF document text
    • https://nigikejogu.weebly.com/uploads/1/3/4/9/134902550/c66be7d6.pdfIn PDF document text
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/kikudusu.pdfIn PDF document text
    • https://lovarewido.weebly.com/uploads/1/3/4/3/134322716/wanidevisij-gitedot-mapomoxijukuker.pdfIn PDF document text
    • https://mekupefaju.weebly.com/uploads/1/3/5/3/135316310/6507181.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/b9b0ea71-38eb-40d2-822a-cbdc0e26f84f/mere_christianity_book_3_chapter_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f4cc303-fce6-4391-adf0-de2226597f36/what_are_the_theories_of_abnormal_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8923f42b-2b50-4332-af82-2269daea0ec4/54385577776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5034db5-4c8a-44b1-8940-ec60f5058707/how_to_perform_visual_field_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd593d5e-4b1c-41a9-8962-0432af3f885b/14472287731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f958469b-e6a4-4e4f-9b9b-e542ab7ff378/bilimewetiriwe.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_off0000d5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AA 5160 bytes
SHA-256: 9bfe288af447f954880294459e5b7ed36ff4837092c5ae41844d952f3186f963
font_01_sfnt_off0000e736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE736 9896 bytes
SHA-256: 5595b08ab2b635e8d805ceea7f203a6beab8ed1170bd175bb6f47233bb9634c1