Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d3b255b2015334…

MALICIOUS

PDF

67.8 KB Created: 2021-02-22 19:11:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: e7970b864705480921085a969a7a09fd SHA-1: 673bae8b37ec1ff5c5c12371fce45ca6c2c3a87b SHA-256: 98d3b255b2015334a243415874c85b16155dd2217e1c699411dbe0811782da8e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying it as a link farm designed to host many PDFs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to download further content.

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
  • 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://seumenha.ru/wix?keyword=emuparadise+apk+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460070/normal_6015837316545.pdfIn PDF document text
    • https://fuzedefona.weebly.com/uploads/1/3/4/5/134578490/sebegalile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417138/normal_6025a333453ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427293/normal_5fff5d61edd35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405185/normal_602c65d5761f7.pdfIn PDF document text
    • https://jekosupoma.weebly.com/uploads/1/3/1/6/131637113/vitano_moxot_totexebiz.pdfIn PDF document text
    • https://rogebanapixiwo.weebly.com/uploads/1/3/5/3/135343373/pumafesoje.pdfIn PDF document text
    • https://tixowofo.weebly.com/uploads/1/3/4/5/134592641/kabek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449599/normal_5fe644b699532.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/jehgjg3/ny_forward_safety_plan_template_in_chinese.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/satulibaren/wupodobazasufuwobozev.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/bengali_detective_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/67072149972.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/bearings_using_sine_and_cosine_rule_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/madig.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_off0000ccf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF7 5300 bytes
SHA-256: 5a3c197d98002a9e14388cc205b8d831a7b54ea5427815229e8e8e6301050323
font_01_sfnt_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 10212 bytes
SHA-256: e3386c84c34b549c85fb6114f5cdd58474df863e0a198dd1f1280aae49b39c9b

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