Malicious PDF — malware analysis report

Static analysis result for SHA-256 4321adcc02b1779a…

MALICIOUS

PDF

64.9 KB Created: 2020-12-14 22:16:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 880156f173ee266637ee3dd621c59418 SHA-1: 2191a464481be327c9ecc1ae70bf99a4a820761d SHA-256: 4321adcc02b1779a58af0c8efd4024c154dd22359308a787430ebca7e79716d3
274 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics, including a critical finding for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'backup android whatsapp messages to pc', suggesting a lure. The presence of numerous embedded links, many pointing to PDF files on various hosting platforms, indicates a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection further support its malicious nature, likely involving phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://gettraff.ru/aws?utm_term=backup+android+whatsapp+messages+to+pc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375891/normal_5f915191a9216.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402280/normal_5f948f1a2e52c.pdfIn PDF document text
    • https://karozazosepi.weebly.com/uploads/1/3/4/3/134316788/wafovisurigomativ.pdfIn PDF document text
    • https://ximazula.weebly.com/uploads/1/3/0/7/130738777/kifanegewuvub_pavawobukosaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481665/normal_5fc219471dcec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401538/normal_5fc4ab2d3349e.pdfIn PDF document text
    • https://kuvinonufero.weebly.com/uploads/1/3/4/3/134307364/wepimapejekagoxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/95f23120-214a-4da7-9e18-5e05a87d2e06/tokodevux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fd6d6b3-f0a3-4dc4-aacc-76bb2f73d9c7/26579213443.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/comment_attirer_la_chance_sur_soi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/546b163d-fb5d-4288-89af-2e0672ff435c/jupakinaxukavag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f9cb8b8-266d-42de-8dca-288ed50e127d/rinoxujelulukagufi.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_off0000c256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC256 5660 bytes
SHA-256: fb6e933d5b765fdb99922f3a482252d323f042406ac0e2104cb2117e68c485e9
font_01_sfnt_off0000d582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD582 9828 bytes
SHA-256: 7efac264a30f7b50a045dfee364d251c91d171d0d02daa051626b71db9f23778

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