Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c23d529d95c2ec0…

MALICIOUS

PDF

72.1 KB Created: 2020-11-19 00:21:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 83f25119ad74ef25d3b9de322f325f11 SHA-1: c7c981524aba93ccd2062d569c4b79af24b6271a SHA-256: 7c23d529d95c2ec0822fe5f75f89224a2dfdbb98c9e987e6c3a9fd56e54370b9
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, as malicious. It contains a large number of external links, suggesting it is part of an SEO link farm or a phishing campaign. The embedded URLs point to various domains, including trafftec.ru and multiple weebly.com subdomains, which are likely used to redirect users to malicious content or phishing pages.

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://trafftec.ru/123?utm_term=nubrilliance+microdermabrasion+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403415/normal_5f9926ad6da18.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/6374515.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/2122744.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411691/normal_5f98ca800b7da.pdfIn PDF document text
    • https://mupipuko.weebly.com/uploads/1/3/4/3/134370635/71772.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380527/normal_5fa491fbf00a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385038/normal_5fafab515af10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379618/normal_5fb2e212b81c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_5fa216d23d27f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392661/normal_5f9e128e65e31.pdfIn PDF document text
    • https://radewisuvux.weebly.com/uploads/1/3/4/6/134689192/864695d05bc10.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/dutimajizowa/patrick_connolly_md_neurosurgery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/835c28d9-31b7-4ed4-9741-1d7f649859b6/33734692094.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/manual_blood_pressure_cuff_parts.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_off0000d2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E8 5076 bytes
SHA-256: 290fef38f85a36704959becd3df239c11c179a5a801cd0607078edf6abd09a32
font_01_sfnt_off0000e3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FC 9864 bytes
SHA-256: e9f35f05a0ff3fcacb5fed9bda4bafdeb25a8a7d4f510a100a7b7c5c462b1fc8
font_02_sfnt_off0001056b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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