Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac9cc90dae2486b…

MALICIOUS

PDF

79.4 KB Created: 2021-01-11 03:53:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c934a0e5808ce22f5057e0055f425d19 SHA-1: b093935d9e887b7cfeb23e2ae8621bf0dd5dc335 SHA-256: 8ac9cc90dae2486b640a634709dcf84073af2deba3e94cb79516e580322ba43f
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=tuff+torq+k92+service+manual In PDF document text
    • https://waboralitenir.weebly.com/uploads/1/3/4/5/134504299/fifobugonatogak.pdfIn PDF document text
    • https://kedixusivazusug.weebly.com/uploads/1/3/4/8/134869684/fixevofap.pdfIn PDF document text
    • https://nolalitikobuno.weebly.com/uploads/1/3/4/7/134768790/befofekifa_nejotokomolugen.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/AsgVjfE/paint_sprayer_rental_medford_oregon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373259/normal_5fc13d1e18f92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392660/normal_5fa0a99f692bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404113/normal_5fc070407b4ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417834/normal_5f970cb636cee.pdfIn PDF document text
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/jafam-wumipojumixodu-giwasoxisezaret-bixulufazo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xuzed/eagles_wings_reuben_morgan_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/activity_3_analyzing_greenhouse_data_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/the_adventures_of_ulysses_study_guide_answers.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_off0000f68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68B 5516 bytes
SHA-256: caa7044c38fa3c9e82b8e15e882377a497191e3472b9bd548f4193e887c63853
font_01_sfnt_off0001094a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094A 11572 bytes
SHA-256: 55592c3294467de27acf6bd5641bfdad7aabbd36c96e14f662601d465663b7c4

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