Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d99287f099e71d0…

MALICIOUS

PDF

69.0 KB Created: 2020-12-07 08:31:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a54ab5c88ea49becc9eea74009e9a458 SHA-1: 7b5853ecdcde5705602fb9810b84a144afe39639 SHA-256: 7d99287f099e71d0874ec7a8af96dc373397e74535b43a9085d40d081b68416d
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links likely serve to redirect users to phishing or malware distribution sites, masquerading as legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/aws?utm_term=dame+cicely+saunders+books+pdf
    • https://lifitexuga.weebly.com/uploads/1/3/4/3/134356919/mosepob.pdf
    • https://cdn-cms.f-static.net/uploads/4376602/normal_5f8aa925f25e0.pdf
    • https://wudizibi.weebly.com/uploads/1/3/4/4/134477582/a06d8ad20.pdf
    • https://pakoverixofe.weebly.com/uploads/1/3/4/7/134771358/1174014.pdf
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/84d6aa755817178.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/kewuxejikiwe/moai_on_platform_apah.pdf
    • https://static1.squarespace.com/static/5fc0ed17f7cf8c75402b0ccf/t/5fc12d1a4e98326c023a86d7/1606495514328/combining_sentences_worksheet.pdf
    • https://static1.squarespace.com/static/5fc77a872122570d58026833/t/5fcb2b93551bdc47e7a443b2/1607150484273/ziggy_zagga_new_gen_halilintar_piano_tiles_online.pdf
    • https://s3.amazonaws.com/ninazarila/employment_contract_philippines.pdf
    • https://static1.squarespace.com/static/5fc0e92a0a2757459be2ed0b/t/5fc15bf5f3de5e49b5974b95/1606507510000/78898505550.pdf
    • https://static1.squarespace.com/static/5fc0de9c5bcb0228a2825217/t/5fc14747eaf37e3b64cb1888/1606502219122/44374235654.pdf
    • https://static1.squarespace.com/static/5fc4d1089955c744b55487a1/t/5fcb0929190ee82df8d5f9a1/1607141674181/upholstered_dining_room_chairs_walmart.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb7f.bin
24500f26e7151504df0a88447026e797f32b6267218b77e96702fe539ea7471b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7F 5408 bytes
font_01_sfnt_off0000cdc1.bin
26418e8d9e4a1d789ce783f671f9648aae383de4227e4e8c5d5ce2f0ab6c4447		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC1 13888 bytes
font_02_sfnt_off0000f944.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF944 4324 bytes

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