Malicious PDF — malware analysis report

Static analysis result for SHA-256 874879ec0d43ba2d…

MALICIOUS

PDF

71.8 KB Created: 2020-12-30 17:33:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 91ae1c3ecdf31f9591d0b842e597d7a3 SHA-1: 87913fd078a73366e213e2d853984604a2e8dad9 SHA-256: 874879ec0d43ba2df101d3f40f2cb6607a8580cb550ade8753f4643e532a672c
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The presence of a link farm suggests an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/123?utm_term=lake+of+the+arbuckles In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410216/normal_5fac225ba26e2.pdfIn PDF document text
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/2489de61fd.pdfIn PDF document text
    • https://cdn.sqhk.co/tatiwurixiwo/jeIVc2o/saving_from_drowning_crossword.pdfIn PDF document text
    • https://cdn.sqhk.co/vawikepaf/RIQDaCz/xoxoziwaripad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417519/normal_5f9724973f85a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501029/normal_5fd2c6b726090.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488116/normal_5fc49a8545a92.pdfIn PDF document text
    • https://cdn.sqhk.co/zolaxadivowe/ST27OFY/domino_theory_cold_war_facts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375344/normal_5fd20282b217e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420760/normal_5fad9b9f33a89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417118/normal_5fcaf4cf927dd.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/jcqjbXR/jiffy_lube_coupons_in_albuquerque.pdfIn PDF document text
    • https://sibitolifi.weebly.com/uploads/1/3/4/7/134732274/2774581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388406/normal_5fa58aad055fb.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/jepinebawo/mobogenie_for_android_free_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/naluxolaxog.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_off0000dc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC80 5112 bytes
SHA-256: 266f59751e169ba1b86baddb965cf83c4d94c0adc8c276ab4270f9b1d6e413a0
font_01_sfnt_off0000edec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 10696 bytes
SHA-256: 5a1ff7ad5b3139cf7eeaceb178e58e2adb09cd225796edd25a3611b277d49b58

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