Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55701fd03f4a8d7…

MALICIOUS

PDF

66.0 KB Created: 2020-12-06 09:45:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7e0df47a1be22b4b7f6098b9b23fb22b SHA-1: 7bb6646f4eceb1a5643cec5d405b080fadc39077 SHA-256: b55701fd03f4a8d7822f396b3c002d11958c0a3ab0dbf227ad4cf2bef43b2c1c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic identifying it as a PDF SEO link farm. One of the embedded URLs, 'https://trafftec.ru/aws?utm_term=bo+go+unikey+4.+0', is a primary indicator of malicious intent. The ML classifier and ClamAV detection strongly support the malicious verdict, suggesting the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/aws?utm_term=bo+go+unikey+4.+0 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368970/normal_5fbb6a9fade7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408991/normal_5f93948e97832.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/bixugerarofagoxufof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460043/normal_5fa6c04c78a7d.pdfIn PDF document text
    • https://mudagetani.weebly.com/uploads/1/3/4/3/134381332/fejatozetevu-juleb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5647016-91c5-4c13-b247-4ade818077f9/6118259928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/351a11ed-e4c7-447c-8e6c-b85a6129c5e7/jerinufowitedaxomumit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bab9adad-7c26-417d-a9b9-2429c5227f03/2007_buick_lacrosse_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fef1e05a-1f43-45bf-9a5c-64a16cd1326f/21744521337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06d13331-9aeb-4c9d-a2d7-5ab846b03add/kefosexez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58a548d4-6352-44fa-9227-b271aea64698/grapes_of_wrath_movie_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f67b8b13-dd22-4fe8-a9df-aa38b4a1d8f1/xp_sp2_32_bit_iso.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_off0000c074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC074 4816 bytes
SHA-256: ecd47a51b076035c6cda9be9c1bbb18923288ef56e70e5339d945a89584d8bf5
font_01_sfnt_off0000d114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD114 14580 bytes
SHA-256: 7c616276076e63a7edbf432c4cdd1c3f4dfd61b2ff1d0a37b9122b7fb61eac71

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