Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10db4935416f9b0…

MALICIOUS

PDF

66.4 KB Created: 2021-01-17 08:52:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0cdaf31b74c370453e241653215e1eec SHA-1: b8fa04d583ca1a5e6833f67e741d1ee62d338b8a SHA-256: c10db4935416f9b0c58a16edc3a816b53474c855b78456c25224102c38068864
274 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics, including critical detections for a malicious redirector link and brand-impersonation credential phishing (PayPal). The embedded link directs to a URL that is part of a link farm, likely intended to host phishing content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://jaxedafotonomut.weebly.com/uploads/1/3/4/8/134885779/tekupugu.pdf.
  • 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://ggtraff.ru/123?utm_term=heaven+the+official+study+guide In PDF document text
    • https://jaxedafotonomut.weebly.com/uploads/1/3/4/8/134885779/tekupugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5f8abae2e5478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453333/normal_5fb713df42613.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/W6ghuMG/ledefusovejewoloxalidukum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406812/normal_5fb3f74e17bc3.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/ZjjjPUb/vivabufatubononudadum.pdfIn PDF document text
    • https://pozimetotekiv.weebly.com/uploads/1/3/4/3/134339641/nurukuvogimutunuki.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/2xgj1ha/shooter_lube_ingredients.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385204/normal_5fff0c5b2c7b5.pdfIn PDF document text
    • https://cdn.sqhk.co/filemowa/3842yXi/bakery_wedding_cakes_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416151/normal_5fd9f4874cc04.pdfIn PDF document text
    • https://site-1191950.mozfiles.com/files/1191950/paypal_account_limited_fake_email.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/zozofufulolig/pevonunuzogubi.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/9909381131.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_off0000c9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F0 5312 bytes
SHA-256: 9948c72d7d73f42cbcdc45ffef1047dba7feed86f5562ff948a26b82cb88d5c6
font_01_sfnt_off0000dc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC14 9664 bytes
SHA-256: 1a218defda54144ee0ce0e7976951f2f83ae8ea68bd0384a99c496c203efb568

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