Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a4cbcef6401ac2…

MALICIOUS

PDF

66.5 KB Created: 2020-11-24 20:16:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1c16bf78226952b820cb8b948f4aee1b SHA-1: 92b7e0a27f531e7626f027803c7c3bde4d03a743 SHA-256: 97a4cbcef6401ac236df3321d62cc659ee9496c6ade53b19517091b34b336fc1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, identified as a "PDF_SEO_LINK_FARM" heuristic, suggesting an attempt to drive traffic to a network of sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafffi.ru/123?utm_term=topic+master+ideas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375341/normal_5f91d21a00a1e.pdfIn PDF document text
    • https://tuxazapewim.weebly.com/uploads/1/3/4/8/134846749/dizesidiseduz-lutinizezi-bilaz-jebakunuti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372696/normal_5f9aca60106f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5f9dd588ecc6b.pdfIn PDF document text
    • https://xulajaxosu.weebly.com/uploads/1/3/4/3/134366267/725590.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/e545df90-099c-4bc4-9afc-3053661e66f8/harris_middle_school_neisd_78247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f98db4c-9918-49a0-8c97-24a0e81bd368/wesebajadira.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a18804b-5604-49c9-a52e-7947d62f28f3/pogov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0311e428-0a47-4bfe-8ee0-37810b30eaf0/62270943964.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0af136ca-fb81-4493-8b92-6e40793d2a27/obscure_aftermath_ps2_iso.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_off0000c9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D7 5136 bytes
SHA-256: c6c09dbf143f0d0ecc9088cbe1ae7ce3134661b2fbadb81b07ceb899df5ff509
font_01_sfnt_off0000db2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2D 10140 bytes
SHA-256: bd349ae11a67dfa3e61adef3e41548b8314bcc02f88bd1f60734b14f30c28f4c

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