Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99b787cf2b91978…

MALICIOUS

PDF

70.7 KB Created: 2021-02-27 07:26:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5f7148a524090703291e88891db1827c SHA-1: 8fbd7b822205d1033f8bc371ec8af00fd6f62002 SHA-256: c99b787cf2b919781e5a5c26646dbf9f588d3124237c6807b73aee653bd8e280
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, and contains a large number of external links, many hosted on disposable domains. The document body, though heavily obfuscated, suggests a lure related to a 'Kenmore elite top load washer owners manual', likely a pretext to drive traffic to the linked sites. The presence of numerous external links indicates a link farm or redirection scheme designed to lead users to potentially malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/wix?keyword=kenmore+elite+top+load+washer+owners+manual PDF link annotation
    • https://biwoponafi.weebly.com/uploads/1/3/4/7/134767969/bapozudiritumof.pdfIn PDF document text
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/27db60cf2.pdfIn PDF document text
    • https://vixagukire.weebly.com/uploads/1/3/4/3/134364056/jokipuvodewig-wozapusom-biwaw-wukixunu.pdfIn PDF document text
    • https://webuwexuzebonal.weebly.com/uploads/1/3/0/7/130775053/naxadenes.pdfIn PDF document text
    • https://fafetomipisiso.weebly.com/uploads/1/3/4/6/134603542/97d3992f2a.pdfIn PDF document text
    • https://cdn.sqhk.co/zamokaxu/ogghif4/get_followers_and_likes_simulator_clicker_game.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/goguvowexewafu.pdfIn PDF document text
    • https://sawamamuwez.weebly.com/uploads/1/3/5/9/135992332/2aed6aea5.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/JgdtMvU/cbs_sports_franchise_football.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416666/normal_5fec7c8a3d604.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390641/normal_6007a47211293.pdfIn PDF document text
    • https://girawosanisab.weebly.com/uploads/1/3/0/7/130740609/fexofizokiwefovovi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369796/normal_5fe468ac59cde.pdfIn PDF document text
    • https://fakavenudir.weebly.com/uploads/1/3/4/0/134042443/mixugerare.pdfIn PDF document text
    • https://cdn.sqhk.co/pidagasew/41AYcui/checklist_template_word_free.pdfIn PDF document text
    • https://duvinibekumexeg.weebly.com/uploads/1/3/4/6/134677329/pisapomepinax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tafiwepamubov.atwebpages.com/mawinexirun.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_off0000d656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD656 5260 bytes
SHA-256: 811958d2b33cc01befa75aef8761325ffcce8b68d0a61498f8385c429f85e7ed
font_01_sfnt_off0000e81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81C 10976 bytes
SHA-256: e82ca3c02be62d4a65f1631c3ef48f9de7bbdd2a273cad6b816369b5f050176b

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