Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa8a80b09496bc2…

MALICIOUS

PDF

78.4 KB Created: 2021-02-18 07:34:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 418e3ff8d5a950d0f00863edf189d9c8 SHA-1: 2772fafa94d87837391a2bcfdfe520d99b402fb2 SHA-256: 7fa8a80b09496bc2bf4ceda497f6a73ca46e031e46d4dc7c8c9634461555cae2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate that the primary purpose is to redirect users to potentially harmful external sites.

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 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://baarspo.ru/123?utm_term=husky+pressure+washer+wand+repair PDF link annotation
    • https://cdn.sqhk.co/xezakomujar/Ejdidp8/scary_granny_teacher_horror_grandma_house_escape_room.pdfIn PDF document text
    • https://bisigibibozika.weebly.com/uploads/1/3/4/4/134438783/1056928.pdfIn PDF document text
    • https://cdn.sqhk.co/vudemijugamu/qididL0/32573188240.pdfIn PDF document text
    • https://lupawepenotude.weebly.com/uploads/1/3/1/6/131606523/memaxuwovujix_ronajemiviniwe_gajew.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/Ghejjxm/samsung_alpha_battery_2500mah.pdfIn PDF document text
    • https://fefirewaw.weebly.com/uploads/1/3/0/7/130775199/gareges.pdfIn PDF document text
    • https://jerusofiv.weebly.com/uploads/1/3/0/9/130969981/nexofexazu.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/mexijegedakol/ceiling_fan_room_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/xajoxaxuvemerugo.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/lavoxo.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/54818265745.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_off0000f53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 5232 bytes
SHA-256: 8dd1a6526ee627c6ff862f475b514eccfc7ea3f023f895d5647daf250567bcd6
font_01_sfnt_off00010712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10712 11292 bytes
SHA-256: 859bb800d29a346ea36f50157432daf826a0fd62a5553f76c8332ead8ebf78ad

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