Malicious PDF — malware analysis report

Static analysis result for SHA-256 da79b28e1375b100…

MALICIOUS

PDF

79.2 KB Created: 2021-06-09 10:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1ff46c4928a43c215d53f15e7b5a397c SHA-1: ed5f1766ef86e5f50e734c6abed98054ca16c8e4 SHA-256: da79b28e1375b100274468a932e91b9dc866244728895c1b2dcdbc99db890dde
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm suggests a phishing or malicious redirection attempt, likely leveraging embedded JavaScript for obfuscation or redirection, hence T1059.007 is included.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://huntic.ru/pbw?utm_term=los+angeles+april+weather PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479470/normal_603bed4c89ac6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481518/normal_5fd9d471d762f.pdfIn PDF document text
    • https://vetexugosopaviz.weebly.com/uploads/1/3/0/7/130738505/sasume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391000/normal_600dc8822615f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4409409/normal_60b308568fac4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393502/normal_5fdf8619740ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402488/normal_5ff315871d9d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446774/normal_6033384cac8ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475863/normal_5fcf01c7a657c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478932/normal_5fdbfad727b3d.pdfIn PDF document text
    • https://kabuvegezukab.weebly.com/uploads/1/3/5/3/135325093/bekegag_bodezagu_bagetaginir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415327/normal_6009aff6c2e23.pdfIn PDF document text
    • https://sulewonabesonu.weebly.com/uploads/1/3/2/6/132682327/bufozonepon-paxetod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447906/normal_603710c7ace0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459636/normal_6019666e423dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495241/normal_6011d88dc86d2.pdfIn PDF document text
    • https://pebetojakudasud.weebly.com/uploads/1/3/4/8/134879391/xefuwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451208/normal_606d586dd4242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495973/normal_6068264b36cd7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/10f722bb-f7fd-47ba-80b5-df50739da92d/bosch_silence_plus_error_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/997b9f66-e1ed-4ac5-8f19-2e4d0f53d269/suzezow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80639baa-f023-4059-bbea-387d0effe3bf/printable_math_worksheets_simple_addition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df94b633-89fc-46d5-ba1e-26f220207eaf/how_are_you_feeling_today_faces.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/283fc9c3-3f0b-405f-8430-29374ecd5f7f/sony_playstation_2_iso_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEE 4904 bytes
SHA-256: 74ba0a4fa94523f4d5c5ddbdb1eb3c8b17a5a93173a2c228b3cbecb7188d6dad
font_01_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 11080 bytes
SHA-256: 1ecf64cf0665fba20fed25400ec37b36e4e9c62024cbc2e23ed807cf9d42c9c2
font_02_sfnt_off0001214f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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