Malicious PDF — malware analysis report

Static analysis result for SHA-256 af65f336f1547e54…

MALICIOUS

PDF

83.5 KB Created: 2021-03-28 13:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2e7ac8bb0c5df1db757f882e59a1707c SHA-1: dcd97dc10cad1435d5200f3422f64bfc79401753 SHA-256: af65f336f1547e54d042ec3aa2f5cce6e8e2aaf1cb55c88638634941e843277d
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating it is likely a phishing or malware distribution lure. It contains a large number of embedded URLs pointing to various domains, many of which appear to be disposable or used for link farming. The primary function seems to be redirecting users to external content, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://yafferge.ru/award?keyword=speak+graphic+novel+pdf+free+download In PDF document text
    • http://waliduv.mypressonline.com/16875675012.pdfIn PDF document text
    • https://cdn.sqhk.co/neseleko/jeQfcgf/bingo_dice_free_bingo_games_hack_tool.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/23442131750.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/the_andromeda_strain_2008_part_2.pdfIn PDF document text
    • http://tonukavugu.mygamesonline.org/biogaia_gotas_dosis.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/on_the_road_truck_simulator_free_download.pdfIn PDF document text
    • https://petuxomurekag.weebly.com/uploads/1/3/0/8/130874153/8c65b5ffaea9e.pdfIn PDF document text
    • https://dibapanapuro.weebly.com/uploads/1/3/0/7/130776085/peveb.pdfIn PDF document text
    • http://leludezoz.scienceontheweb.net/algebra_2_trigonometry_textbook_mcdougal_littell.pdfIn PDF document text
    • https://fejilezujew.weebly.com/uploads/1/3/4/3/134340931/kanat.pdfIn PDF document text
    • http://joweponula.mywebcommunity.org/toyota_corolla_verso_owners_manual.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/zesuvizawuleremeduda.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/19472031064.pdfIn PDF document text
    • https://vurovovi.weebly.com/uploads/1/3/4/0/134040995/7063052.pdfIn PDF document text
    • https://faxufoxexukixel.weebly.com/uploads/1/3/4/4/134455740/eac76.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/iuAijgf/puffin_web_browser_download_for_pc.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://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_e0f8d72676784931b725b1e8e9242c88.pdf?index=trueIn PDF document text
    • http://pezamax.myartsonline.com/tixedexotukosiwome.pdfIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_2871e858a8794222aaee7629706ff0a7.pdf?index=trueIn PDF document text
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_6de5621553fc40c7a8ee066cf1c2725b.pdf?index=trueIn PDF document text
    • https://43466d02-873c-4564-b63c-f2f79aa6d38e.filesusr.com/ugd/fd64e8_065a2dc12eb2499491b415870bee48eb.pdf?index=trueIn PDF document text
    • http://petojijoxura.onlinewebshop.net/47090437624.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_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 5264 bytes
SHA-256: 6c8d333a6170fa2d56c924b20af4db3cae98aee15b4751dda7609ab6b276998f
font_01_sfnt_off0001091c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091C 12376 bytes
SHA-256: 2b135d6835d58de1836b3432142e1a05bcc3ed856a758108300c1e5eeafe1dea
font_02_sfnt_off00013204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13204 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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