Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd9ed578b66e2b1…

MALICIOUS

PDF

75.4 KB Created: 2021-02-25 19:00:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a69b3c10d7be68079a231c0fc2dbb6f4 SHA-1: d6dd37eef09b88a5c3760701ad9bad14740db7c2 SHA-256: 7fd9ed578b66e2b1ee7b227dd74ac0c132917722288b5c29fd4e35b8c8da50a2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on potentially malicious hosting. Although no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score suggest malicious intent, likely related to spearphishing.

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
  • 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://seumenha.ru/123?utm_term=hp+color+laserjet+cp1215+black+toner+cartridge PDF link annotation
    • http://gladkoe-telo.xyz/6947740128nlgj1.pdfIn PDF document text
    • https://jibunomo.weebly.com/uploads/1/3/5/3/135348462/mujena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412775/normal_6027cf6b28dbd.pdfIn PDF document text
    • http://dixojele.22web.org/youcam_makeup_camera_free.pdfIn PDF document text
    • http://bufo.online/what_is_metabolic_process_of_wine_makingluikz.pdfIn PDF document text
    • http://sale20.site/mackie_cfx12_mk2hapih.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387925/normal_5fd9e94cecc5c.pdfIn PDF document text
    • http://steelsho1.club/grade_8_english_cambridge_course_bookxi3kc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389097/normal_5ff2d2a1d530b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483071/normal_6015b6ebac7f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483836/normal_6031832968fba.pdfIn PDF document text
    • http://trells.space/kizowudevevatimatowiax4l.pdfIn PDF document text
    • http://xajoraxi.22web.org/proxysg_configuration_guide.pdfIn PDF document text
    • https://pofexetebi.weebly.com/uploads/1/3/4/5/134592759/3169502.pdfIn PDF document text
    • http://miiliioner.xyz/falotepimipa50s5q.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/95410043560.pdfIn PDF document text
    • https://tuzebomutiwok.weebly.com/uploads/1/3/1/3/131398369/a6eddd67ec.pdfIn PDF document text
    • http://penageli.getenjoyment.net/will_raphtalia_marry_naofumi.pdfIn PDF document text
    • https://penegekefifix.weebly.com/uploads/1/3/4/5/134586424/4436907.pdfIn PDF document text
    • http://neuroncraft.online/81036393456e9jjn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rosajeku.myartsonline.com/dazizorekimoliperuke.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_off0000e42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42C 5792 bytes
SHA-256: cba026ed93ab9b603b7098616b0b835b6fd8ee95e0228975e582a63ce188f734
font_01_sfnt_off0000f7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F6 11424 bytes
SHA-256: 283fcc80f35a4ab316d65a421a9479798b7c3217a7f0573b2774d6abd4a47d39

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