Malicious PDF — malware analysis report

Static analysis result for SHA-256 9761f5eee4f679de…

MALICIOUS

PDF

70.1 KB Created: 2021-03-08 19:11:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 78ca4341371b222d9ff25ef95ecd7ef1 SHA-1: 8eca9e83af2892de9196eeefd5db4fb1c97fc08c SHA-256: 9761f5eee4f679dedd6e45d6c7dda7e0d2f05e9e18dc49c44bb5e2f8ab7eb1bc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to 'three skeleton key answer key' and 'wkhtmltopdf', suggesting a lure to a potentially malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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://lozipotod.ru/aws?utm_term=three+skeleton+key+answer+key PDF link annotation
    • https://cdn.sqhk.co/mizipudi/hc4hehg/stickman_anger_game.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/Midu95a/motogp_usa_calendar.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/2QXgdif/votixif.pdfIn PDF document text
    • http://kogikisarazomel.22web.org/35827474600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410418/normal_601629a013f25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470540/normal_6040056a33ebb.pdfIn PDF document text
    • https://cdn.sqhk.co/purorenutuw/bjdsjg9/4_pics_1_word_daily_puzzle_chile.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/ghiiff3/patukurajiw.pdfIn PDF document text
    • https://sijupazijeter.weebly.com/uploads/1/3/4/6/134639914/vesimezalo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448346/normal_60159e584f2ef.pdfIn PDF document text
    • https://zitadinenere.weebly.com/uploads/1/3/1/8/131871439/5343835.pdfIn PDF document text
    • https://cdn.sqhk.co/suwojixuwebi/fYidvZz/vidgo_channels_in_my_area.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374517/normal_601a1c84c9093.pdfIn PDF document text
    • https://kumajevebak.weebly.com/uploads/1/3/1/8/131856027/1b6bf.pdfIn PDF document text
    • https://cdn.sqhk.co/waxigapo/jbtix80/find_snapchat_friends_on_instagram.pdfIn PDF document text
    • https://rusokakes.weebly.com/uploads/1/3/4/0/134016884/9557379.pdfIn PDF document text
    • https://povurumupun.weebly.com/uploads/1/3/4/8/134884194/tekinizage-vexonuvuziba-vinat-jukofudir.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/lm3gdhf/fuvizazujevakafaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://baxuzotaxuli.epizy.com/paxogoxe.pdfIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_f845f7a098a94d1a98c556bf2b0c97a8.pdf?index=trueIn PDF document text
    • http://xedotoxedutowad.epizy.com/6486918537.pdfIn PDF document text
    • http://desetezovadu.epizy.com/javascript_guide_free_download.pdfIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_207eadc7d60641979e6f52ad6680e9c8.pdf?index=trueIn PDF document text
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_e6b06a9732114d918c00cece3fdc991f.pdf?index=trueIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_9b2e8336361d4206884507d47a9f7780.pdf?index=trueIn PDF document text
    • http://gemiwojo.epizy.com/zumaw.pdfIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_4a5397cfe1cc4c1486c1fcba9ba71f49.pdf?index=trueIn 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_off0000d6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B9 4980 bytes
SHA-256: 35b52ebeba094bcb1d6f4fb3956adb25f403b8dbc56a06690da18ba8483b4d46
font_01_sfnt_off0000e7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B8 10380 bytes
SHA-256: 76be42e7e213e1d06e74c240f28ba0911736eb435fc18b373f51ed34cee42ba3

Open this report in the interactive analyzer, or submit your own file for analysis.