Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc81bd2ef31e900…

MALICIOUS

PDF

71.2 KB Created: 2021-01-03 12:07:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f7bd0a7cb3dc7ea3af98cb3541ff29e6 SHA-1: 9ef49c12ffbce8a6e653890397eb864c335344ba SHA-256: dcc81bd2ef31e900895d9615a927c0a23515de006979f1d891e176ddff9b11a4
274 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a critical finding of a PDF redirector link pointing to 'traffking.ru', which is a known malicious infrastructure. The document also exhibits characteristics of a social engineering lure, specifically prompting the user to install a browser extension or update to view content, and includes a mass external PDF link farm. The presence of these elements strongly suggests an attempt to trick the user into visiting malicious sites or downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://traffking.ru/aws?utm_term=descargar+whatsapp+web+android In PDF document text
    • https://cdn.sqhk.co/kigifadarija/hd2HhaP/gobovofasamepemebuxob.pdfIn PDF document text
    • https://sewiwojura.weebly.com/uploads/1/3/4/3/134371681/xixoxirefalak_zibewomali_xuxobeni_bekudovugugeze.pdfIn PDF document text
    • https://cdn.sqhk.co/tuledapozato/XjoYBFY/67163435444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487432/normal_5faec8b023abe.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/nonipesikiri/xivoxevafokimebusinogim.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/64786285553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/235433d1-b4c2-4b24-9266-1ebb87c4c7b9/calendar_2021_template_indesign.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/3146958924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6842c658-9ca7-4bbc-9852-4f7e13123789/liwofapezifejibijuguvagew.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/17415097086.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0df1cbc9-bb6a-40a3-98f2-1dae93fbefd1/kozurabezenisasowanudurip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b01dde74-6516-420b-8aeb-afe17ce87304/viganopobapakizixanegapo.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_off0000d910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 5536 bytes
SHA-256: 95b0a7a1876922794474cda98f582dd0cd78037caee754d484636cc039978018
font_01_sfnt_off0000ebee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEE 10588 bytes
SHA-256: 653ae2666a864ee557a70adfa5dc3e9ebaf1de3c41c3774312a0d671eb1dae3e

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