Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3d21fe52b9072f…

MALICIOUS

PDF

82.2 KB Created: 2021-03-20 02:35:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e7d24141eaa9fae69cc845c4cc92d92f SHA-1: 6bbffb7639613fc1d1f23eacf00b4c7ad0041157 SHA-256: cc3d21fe52b9072fc1a26cb4617e0d60b4845f3f4ce8bac44159a4b24c611ff3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and one of these links points to a URL that appears to be part of a phishing or malicious campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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://jacksth.ru/strik?utm_term=how+to+write+in+short+sentences PDF link annotation
    • https://gavabukif.weebly.com/uploads/1/3/4/6/134614168/4595304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489596/normal_5fe6287178bb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488116/normal_5fd90914aea89.pdfIn PDF document text
    • http://radulukolataleb.iblogger.org/how_long_does_ryobi_40v_battery_last.pdfIn PDF document text
    • https://tuboxivodase.weebly.com/uploads/1/3/4/3/134387713/4453131.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477386/normal_5fcac7c188918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486522/normal_6049809c2f5f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466408/normal_6025ad131f0e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413455/normal_5fec593343a6b.pdfIn PDF document text
    • https://tezigawoje.weebly.com/uploads/1/3/1/3/131379443/df43e92e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486359/normal_60379d961e4d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454813/normal_602588537c230.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/lurutopobi/ahmadu_bello_university_post_utme_form.pdfIn PDF document text
    • http://mivajale.rf.gd/bodyweight_workout_for_chest_and_back.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/sakonejevurilomavejo.pdfIn PDF document text
    • http://bubezowi.epizy.com/amnesia_haze_auto_grow_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/canonsburg_police_report.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/79837577556.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/92100212386.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/46873042513.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/traffic_incident_management_training_answers.pdfIn PDF document text
    • http://mevomum.epizy.com/enviar_amadeus.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/bhavnagar_university_online_form.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_off0001055b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055B 4696 bytes
SHA-256: aaa7ee97ae3dc911e481d1404eb1d39618a9479e3e80f1aa2445b59f0df1d3e2
font_01_sfnt_off00011563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11563 11112 bytes
SHA-256: 10d51b67a74418d4000f8727e5bf5aeca1819897f4a275aebe93631fabbd2fb5

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