Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f0f00dcbef1b37…

MALICIOUS

PDF

68.3 KB Created: 2020-11-22 16:21:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b38216c360c02c00e68b95e98d4e036b SHA-1: 3688e3c1d774a9f94345e646b04aec496a5b711a SHA-256: 76f0f00dcbef1b37f85331d0647f916d3f52e1107fee7cfcf012e427a45fa092
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be junk data, suggesting the primary malicious function is within the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/123?utm_term=single+stack+vs+double+stack In PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/fedomejote_gufijubebovexe.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/vijadaw-panadut.pdfIn PDF document text
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/7a140df14de7584.pdfIn PDF document text
    • https://ketabanajav.weebly.com/uploads/1/3/4/7/134707818/benowadapu-wufikol-toverarodofedo.pdfIn PDF document text
    • https://gadabuji.weebly.com/uploads/1/3/4/7/134715747/4f3180895.pdfIn PDF document text
    • https://maviruwatibifiw.weebly.com/uploads/1/3/4/4/134490209/8348648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371013/normal_5fa4a0cf4c40b.pdfIn PDF document text
    • https://lefamadagizid.weebly.com/uploads/1/3/4/7/134704745/rajenuwon.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/53aae4fc-b577-4bc2-838f-cae041473fb0/abstract_reasoning_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f783edb7-21ba-4a60-96be-442c4d293b67/61502272480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52e34de4-5f3c-424a-ab79-29aedef85782/56966708183.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17cc307e-8be9-41be-b262-0d2e59cf1482/femomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64a15b55-11ee-422a-9c44-2c6d51d0c19d/luxav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e61f8805-c18d-4bab-9f29-2a0bca9c9aab/kizisasorunudejovinaxi.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_off0000d22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22D 5376 bytes
SHA-256: 8fa8ec6d1bf3098fd9de79f327a847a4d9ea91b581d7620a742cfb7e6ac7dd61
font_01_sfnt_off0000e491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE491 9468 bytes
SHA-256: 84d44d93c62572f7269b7ff62602d8bd82762ca87073dd569bfdf06a3b5e5d52

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