Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c457f84ac29e10…

MALICIOUS

PDF

73.4 KB Created: 2021-01-14 23:57:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: bfc460f729b1a07ce743b8cd31926a68 SHA-1: 8d400eb5b35269d4309316465031c41d1feceb54 SHA-256: 58c457f84ac29e10bcfe7f0c741390785943f99fa9c7c7257a208d378f08af1e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting it functions as a link farm or a redirection mechanism to malicious sites. The embedded URLs and the PDF structure strongly indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=abraham+twerski+libros+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375507/normal_5f8ab04211f55.pdfIn PDF document text
    • https://site-1172077.mozfiles.com/files/1172077/drift_club_forza_horizon_4_cars.pdfIn PDF document text
    • https://site-1177392.mozfiles.com/files/1177392/animal_abuse_report_houston.pdfIn PDF document text
    • https://namikefazexu.weebly.com/uploads/1/3/1/6/131606603/wawisegixoto_kogexituwuremob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408340/normal_5fc186d85453b.pdfIn PDF document text
    • https://cdn.sqhk.co/merivexasug/gjiXNEs/fijixiviva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373753/normal_5f9a1d94462b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453721/normal_5fb87c9758162.pdfIn PDF document text
    • https://site-1168315.mozfiles.com/files/1168315/88808747423.pdfIn PDF document text
    • https://site-1173903.mozfiles.com/files/1173903/98486725343.pdfIn PDF document text
    • https://site-1168202.mozfiles.com/files/1168202/agrarian_reform_act.pdfIn PDF document text
    • https://site-1178617.mozfiles.com/files/1178617/zelunixasufurawosololub.pdfIn PDF document text
    • https://site-1199448.mozfiles.com/files/1199448/83400217171.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD387 2884 bytes
SHA-256: 9acae863d18811320ffb2449bc1a16c51a6c52f7b46f1b65c54509d799a76b1b
font_01_sfnt_off0000ddc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC9 5568 bytes
SHA-256: a20e44587284154e78671e163be8916b50b5da91cec5ec893b5505d0981165b0
font_02_sfnt_off0000f094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF094 11668 bytes
SHA-256: e4aefd83a361b9f44afa8a06a930bbc4e7d5ea90111b123c6a2ccff1f365265b

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