Malicious PDF — malware analysis report

Static analysis result for SHA-256 60a90eb8b45b4ff2…

MALICIOUS

PDF

70.1 KB Created: 2020-12-17 00:39:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: bba4fb5ba84c9f18a263e2cc347298d2 SHA-1: d6d18876511f2585b5aad270c259c86a9d5ed9f5 SHA-256: 60a90eb8b45b4ff2ad90f3901f4ad846291db7402f40e251f5854c0098a5f930
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a significant number of external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary URLs observed are associated with link farms, suggesting a phishing or content distribution scheme. No scripts were extracted, but the PDF structure and URL patterns point towards a malicious document designed to redirect users.

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 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://trafffe.ru/123?utm_term=kelso+game+roosters PDF link annotation
    • https://nirulutot.weebly.com/uploads/1/3/4/7/134700174/tatote.pdfIn PDF document text
    • https://zusikoxapumobib.weebly.com/uploads/1/3/4/7/134766975/7887952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462980/normal_5fc1a535e46bb.pdfIn PDF document text
    • https://lemorixumo.weebly.com/uploads/1/3/4/7/134748879/suxutigus-sopodosisodu-rezozun.pdfIn PDF document text
    • https://xekexudaxojow.weebly.com/uploads/1/3/4/3/134365032/801727.pdfIn PDF document text
    • https://xiwapidijiz.weebly.com/uploads/1/3/4/5/134511693/witekamikavefig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jepinebawo/cell_biology_books_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/5282916465.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc002d40b6b03258f30bf3d/t/5fc15219173fb5383bd38e51/1606504986326/zelemip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d94a0462-4d1e-4a92-bfd2-c4687db7c67a/82011521046.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/85508729261.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/txt_file_to_java.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB85 4608 bytes
SHA-256: 99c8e4f0872c1406f15020a1999d08117f98c913b2be3e700ebec102c50e7e32
font_01_sfnt_off0000db32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB32 10132 bytes
SHA-256: 0bd1ac9ff319916e9a9c7cf21b5c3caaa5d9a5c4f52df6672d92a5044d614de1
font_02_sfnt_off0000fddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDB 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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