Malicious PDF — malware analysis report

Static analysis result for SHA-256 7756446e964b813a…

MALICIOUS

PDF

77.5 KB Created: 2020-12-29 19:07:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 36fbf7f1ff0f861fcead0cf93ca5a8bc SHA-1: bb78a0025e8f6ab0497a89d7993edcd8a0848e3b SHA-256: 7756446e964b813a080969289c423612ffe7599283cb9c69a71493b0995a079e
214 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical finding of a link to known malicious redirector infrastructure and a PDF link farm. The embedded URLs suggest an attempt to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the nature of the PDF and the presence of numerous external links indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/123?utm_term=best+youth+baseball+bats+2016 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403822/normal_5fe92a01e7e2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413707/normal_5fe7614853e4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418367/normal_5f9fb47be2c32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450514/normal_5fce9fa54710e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378621/normal_5f8f1e1de0434.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453118/normal_5fe885d269af2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504554/normal_5fd6ad4076084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402944/normal_5fd68f3cd21d5.pdfIn PDF document text
    • https://jatasurow.weebly.com/uploads/1/3/4/3/134358583/75dfc9f0eef.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/jamokaroxoj/research_paper_on_abrasive_water_jet_machining.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/ruzurepumokijoz.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/l._a._times_crossword_puzzle_answers_today.pdfIn PDF document text
    • https://s3.amazonaws.com/tipakalif/kosabemerowitikalelosepud.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_off0000f214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 5448 bytes
SHA-256: e0974e294a4c5b81ba426893a85dd58f78de818499be367708798cfa034d6e64
font_01_sfnt_off000104a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 10716 bytes
SHA-256: d6424737fbed41eb619d9a799b0d179f8ca8f16265ca3816bff40cba7adc6ae4

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