Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd73d68c872deba…

MALICIOUS

PDF

73.4 KB Created: 2020-11-17 09:54:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33f4232e421888379402aea80a378dc7 SHA-1: 995aae28ff9ecd8514f05e500b78e36254084465 SHA-256: acd73d68c872debad5e09c382c0928d0f8bd67d5604797989b97a51e6514419c
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external PDF links suggests a link farm used to obscure the ultimate destination or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/strik?utm_term=mary+kim+titla
    • https://cdn-cms.f-static.net/uploads/4369502/normal_5f8882047d584.pdf
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5fa3c2a69b20f.pdf
    • https://betoxugibujimiv.weebly.com/uploads/1/3/1/0/131071043/budisuxex-zilafe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/435fe5da-f6be-473c-aa42-158d09551edd/dugizarewonaboxapigov.pdf
    • https://s3.amazonaws.com/wibedubosateg/vowusafoxapaja.pdf
    • https://uploads.strikinglycdn.com/files/76656cda-9ed8-44e0-b267-ee0ae050922f/ninja_fighting_games_unblocked.pdf
    • https://s3.amazonaws.com/wuxibipan/most_common_social_security_questions.pdf
    • https://uploads.strikinglycdn.com/files/6170588a-16cf-4b3c-935f-b55b95b1950b/89769162269.pdf
    • https://s3.amazonaws.com/tiduro/moremojogelaforeninefe.pdf
    • https://s3.amazonaws.com/defipedibe/65695956023.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ceca.bin
473f5d482e01e713ca8433cda8e47df4802760b52ffbcc2a7056d86732b420d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xCECA 4824 bytes
font_01_sfnt_off0000df31.bin
98dc0b770b986e07689276851a85b958916ad6b906ffe7f95b1d2209544dbe24
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF31 10792 bytes
font_02_sfnt_off000103e3.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x103E3 16204 bytes