Malicious PDF — malware analysis report

Static analysis result for SHA-256 0315643c8d0f2dee…

MALICIOUS

PDF

90.5 KB Created: 2021-03-13 19:04:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1c9056531e143c8f9d73176d5d2a1ff5 SHA-1: bcd8ba9f33d4b99cdef1400ba2211cf4215e0957 SHA-256: 0315643c8d0f2dee4f5a44b51f7318b363a27605584651e8fcbc0db27f1889c3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites, likely for phishing or malware delivery.

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
  • 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://zajinet.ru/strik?utm_term=skyrim+special+edition+graphics+mod+guide PDF link annotation
    • http://zelopaqq.xyz/how_old_is_daniel_daley4rnfq.pdfIn PDF document text
    • http://vigastlens.xyz/adilakshmi_purana_kannada_movie_songs2ehiz.pdfIn PDF document text
    • http://cabinetshq.xyz/xoxezatarerw0m71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465257/normal_5fd3af48ec9a3.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/ozjjDhi/tractor_pulls_near_me_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/6Mgc1GD/nudekosorapikukagodoreg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410020/normal_5fe52feb39cf2.pdfIn PDF document text
    • http://fenellalucynelle.info/555633347492mfmn.pdfIn PDF document text
    • https://cdn.sqhk.co/davusegeb/hgvgeib/pianist_english_names.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447888/normal_600fca4c64fce.pdfIn PDF document text
    • http://vebilodugisugod.iblogger.org/demonstrative_pronouns_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452608/normal_6046eb8d27a5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479921/normal_6047c96e9adcf.pdfIn PDF document text
    • https://cdn.sqhk.co/zixapegof/jLjfUyd/1847940477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376101/normal_601ae02f24f34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420765/normal_6019b96bac73b.pdfIn PDF document text
    • http://begemot.space/21792805150u5zn8.pdfIn PDF document text
    • http://icub.tech/jugunaxukanoketoi0t4u.pdfIn PDF document text
    • http://natlegend.space/basketball_president_manager_proz1r32.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wojudor.epizy.com/botim_for_android_4._0._3.pdfIn PDF document text
    • http://vuzozan.epizy.com/bupivobirozanazibisa.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_off0001224b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224B 5756 bytes
SHA-256: ee9bd86b735bee90971c393e8f9d9ea1d8a4e9553622259ac8e3d6782724550e
font_01_sfnt_off000135c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C0 11296 bytes
SHA-256: 74acd418e3190294703889f1769ca6e113d341f8a2f214a74832597165df4b50

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