Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf7c63465d77b20…

MALICIOUS

PDF

77.1 KB Created: 2021-06-04 10:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a9a15477c452b7178e57d55d7630259b SHA-1: c2ec186cd6d979eb9a61853cb0cb17dcd762f8dc SHA-256: 9cf7c63465d77b2016cb6933a282d5c7b879fa893e269d9e4959ae0170736522
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm designed to distribute traffic to various malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/123?utm_term=tamil+movie+2019+new+songs PDF link annotation
    • https://daniveledize.weebly.com/uploads/1/3/4/9/134900130/f849653.pdfIn PDF document text
    • https://vekosakebasagi.weebly.com/uploads/1/3/4/7/134743747/0f32b1d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483082/normal_5fd08f4546756.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367624/normal_6003618e442b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451753/normal_600d448fdf852.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469116/normal_60517126ea233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387226/normal_6067653a20998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451356/normal_5fd1ed359b417.pdfIn PDF document text
    • https://musazulawikale.weebly.com/uploads/1/3/5/3/135305526/kumamunorogutivoxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450907/normal_60508ecb40405.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471275/normal_6030a90f6fe0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372702/normal_5fd99e5bcaf0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461249/normal_606aa18f22476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366637/normal_605f48dde968e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://barumena.pbworks.com/w/file/fetch/144443553/whats_the_difference_between_feelings_and_emotions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cc5e0a1-7c52-4328-a751-5c314435af42/public_speaking_ideas_for_students.pdfIn PDF document text
    • http://garigor.pbworks.com/f/second_conditional_exercises_multiple_choice_online.pdfIn PDF document text
    • http://mogulazedub.pbworks.com/w/file/fetch/144483048/navpers_1306_7_guide.pdfIn PDF document text
    • http://zizovitunex.pbworks.com/w/file/fetch/144601422/44317447470.pdfIn PDF document text
    • http://kakewizajupe.pbworks.com/w/file/fetch/144596949/vito_goedkoop_bestelbus_kopen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd12756c-5b2b-4b1d-94a0-18c2882e9499/gijubupevot.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22F 5200 bytes
SHA-256: 5f055bd0cce3c8e9500a3b37f97f007cb9ac2579722055378af7e79a3637fecf
font_01_sfnt_off0000f3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DD 10876 bytes
SHA-256: 496fc73a76aab05b18cc70cccb9e0cde7cbdfbd3db04fc6cfacd81d28d1aaa39
font_02_sfnt_off000118db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DB 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e