Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5667b8d061d92bf…

MALICIOUS

PDF

68.5 KB Created: 2020-12-31 05:35:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4f0a9f5b966c6244e071f8866b4cff12 SHA-1: d9b5f593f88f86a3bcd44045be66af5395ac52fd SHA-256: f5667b8d061d92bfe395974dc76862a75e979b16eec53b4128b9fbcab4a7dce2
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a PDF link farm heuristic suggests the document is designed to host or link to numerous external resources, with one identified URL being https://trafffe.ru/123?utm_term=plum+pie+recipe. While no scripts were explicitly extracted, the PDF structure and the heuristic findings point towards a phishing or malicious redirection scheme, likely delivered as an attachment.

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://trafffe.ru/123?utm_term=plum+pie+recipe PDF link annotation
    • https://bukodebavuv.weebly.com/uploads/1/3/4/6/134657655/4afba26d31ab48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468536/normal_5feb09c56f62e.pdfIn PDF document text
    • https://rutebamem.weebly.com/uploads/1/3/4/8/134862863/76e0df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415045/normal_5f94e547a2a49.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/fapaga/39146231749.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/wetilixogunekafimo.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/ganawabupixevera.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/barcode_icon_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d994483-a676-4c8e-9b48-91c876063ab3/teoria_musical_basica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce6f1686-bb9d-40a3-a291-4f2e6e8966a3/s_block_elements_class_11_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/sixifunisapaxazanadifom.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/9915969969.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_off0000d1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CD 4692 bytes
SHA-256: 4c28382c0b5f0266c8e2769c09b08f75d9d52b0ae8a5208214be7fd3eb6221d7
font_01_sfnt_off0000e1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 10664 bytes
SHA-256: 61b95ffc2918d598979b7590b91a27925e0f70ec0123d512c773da919b3d9967

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