Malicious PDF — malware analysis report

Static analysis result for SHA-256 727c7c42170ed919…

MALICIOUS

PDF

86.7 KB Created: 2021-02-13 21:17:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 98aca1ea8c128f0cbd173e44dbb15921 SHA-1: 1a8ab9e07f0eca054f8682646048e2644a857c3a SHA-256: 727c7c42170ed9192855c6a9827a2329e3907824e28ec4c5c96144a2da3cd868
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics indicating it redirects to known malicious infrastructure and functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection, potentially leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://yafferge.ru/123?utm_term=bluetooth+racing+games+ios In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382627/normal_5feaec27ac0c5.pdfIn PDF document text
    • http://hardcreditcheck.info/fitotidufavekuvusalirst7sq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_6010a5b038f42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402712/normal_5fe5db612d040.pdfIn PDF document text
    • https://cdn.sqhk.co/jututumogu/ZyNHjhB/98318919473.pdfIn PDF document text
    • https://vonipelimodaro.weebly.com/uploads/1/3/0/7/130738487/zitotunemod.pdfIn PDF document text
    • https://tafibukazun.weebly.com/uploads/1/3/5/4/135400045/2915698.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489732/normal_5fe2871db3f05.pdfIn PDF document text
    • http://wonder-ita.space/pinoravorelonavapo9pwm9.pdfIn PDF document text
    • http://artyom.guru/past_tense_and_present_tense_worksheets17xtl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368228/normal_5fcac50e4753d.pdfIn PDF document text
    • http://forpost-electrica.ru/1018009904241xw2.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/hbifFgh/ballet_classes_for_adults_beginners.pdfIn PDF document text
    • https://rokojilezel.weebly.com/uploads/1/3/2/3/132302907/narevamusugodap-tanukile-dawadezeko.pdfIn PDF document text
    • http://kurs1.xyz/56816074647xgs82.pdfIn PDF document text
    • http://ins.expert/gopabionty.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465249/normal_5fdc29ec230ab.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvitatutuv/A9iehhi/6242773665.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413363/normal_60260c73116cb.pdfIn PDF document text
    • http://vquest.website/linux_administration_bookcstn3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000115c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C1 5264 bytes
SHA-256: 8921c313f6f3c4d69f79ab1c93a760fa6039eabc18a817d0e7c6bf34d3081523
font_01_sfnt_off00012778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12778 11120 bytes
SHA-256: b0ee895b022834c64302b5c7524efe077d032e4e463342ef5d97111d84d937e3

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