Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ec2d0a44f3ab7b…

MALICIOUS

PDF

71.8 KB Created: 2021-02-15 01:37:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 962d134957a96feeeb30f783ae472dd7 SHA-1: 21ca96bab29dcd3aea80b17a9310d7f08af69e57 SHA-256: a5ec2d0a44f3ab7b317987d09664a38a4a31366acccc3c959e769449dff49ae2
126 Risk Score

Malware Insights

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

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies the PDF as a link farm on disposable hosting, reinforcing the phishing/malware distribution intent.

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 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://baarspo.ru/aws?utm_term=mtg+commander+template PDF link annotation
    • http://tgesheff.xyz/virginia_woolf_orlando_bookuhq4q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389366/normal_6018b946e02ed.pdfIn PDF document text
    • http://gidpopiteru.com/setool_setup_v1._1295_free26d0p.pdfIn PDF document text
    • http://detonic-ufficiale.website/tap_tap_gun_all_gunsqqwza.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/iXijjcM/hundred_years_war_definition_world_history.pdfIn PDF document text
    • http://sodobinefudiguw.iblogger.org/2._5_mm_to_gauge_sheet_metal.pdfIn PDF document text
    • http://xarusogu.22web.org/8_pool_ball_apk.pdfIn PDF document text
    • http://itactical.xyz/libro_quimica_analitica_garydeec0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492573/normal_5ff70a35e1c60.pdfIn PDF document text
    • http://uabiomanix.xyz/sakumizg1oag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488102/normal_602587d93b68a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451019/normal_5fcd9e7ff385b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417652/normal_5fe65e73e55a5.pdfIn PDF document text
    • http://igrarazuma.info/gerofotod2u8.pdfIn PDF document text
    • http://premial.su/59317092385kgy7l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bazudujowirev.epizy.com/posufuw.pdfIn PDF document text
    • http://mevedokepovi.epizy.com/entrepreneurship_characteristics.pdfIn PDF document text
    • http://xewabilema.epizy.com/xirulafalojudi.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_off0000dc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 5220 bytes
SHA-256: 5020beb0f622e375eaf2e1cbcf1bcd47f65afde55307f58298c9a3507e7b358e
font_01_sfnt_off0000ee16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 10540 bytes
SHA-256: 9506b6efb78c570c6f33b2cfb619aaa1ee097caafa5dcaf348b74ee9eeffc4e6

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