Malicious PDF — malware analysis report

Static analysis result for SHA-256 918a0d05beb26d01…

MALICIOUS

PDF

73.2 KB Created: 2021-02-28 17:24:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 02e9a2fbaa12f734da085f22c9d3f738 SHA-1: b8e59424a769e6d25c9308057a7b741d3dc111c7 SHA-256: 918a0d05beb26d014f1794a154062575a47b0ecef53a320288f8c8b736ffa140
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. The presence of a 'Download' button lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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://pelibifir.ru/123?utm_term=can+goldfish+eat+daphnia PDF link annotation
    • https://niraniki.weebly.com/uploads/1/3/4/6/134662237/1837351.pdfIn PDF document text
    • https://desalipi.weebly.com/uploads/1/3/2/6/132681317/rojijana-nobimipizuki-sekibiwakof.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/what_are_the_nutritional_requirements_during_pregnancy.pdfIn PDF document text
    • https://pivatebovuwize.weebly.com/uploads/1/3/0/7/130775292/juvovalowesup.pdfIn PDF document text
    • https://cdn.sqhk.co/gulifunanale/BbgeDdT/forigafobol.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/ebmBW5S/vevegewezutagazi.pdfIn PDF document text
    • https://cdn.sqhk.co/rorexamuviz/1cVjajb/mudding_games_for_xbox_one.pdfIn PDF document text
    • https://fitelibisubun.weebly.com/uploads/1/3/3/9/133987071/2725386.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484610/normal_5ff0dcaf18666.pdfIn PDF document text
    • https://fegajasun.weebly.com/uploads/1/3/4/5/134502742/6594985.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415769/normal_5fe0863bb6630.pdfIn PDF document text
    • https://cdn.sqhk.co/roweziwamu/LielXgg/ivan_the_terrible_movie_netflix.pdfIn PDF document text
    • https://gumomerad.weebly.com/uploads/1/3/1/8/131856086/filibopuratipani.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/regovadeje/tikopawisuwapam.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_off0000df93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF93 5112 bytes
SHA-256: 819e3f871d70c0c423a5dc1e736261c1407dbe23d73432a4a169758854547da4
font_01_sfnt_off0000f0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 11756 bytes
SHA-256: 3b04b7fad1b2915d2cb07f74cbfa8fb69fb2ef41ecfd26967dcb58ec08800879

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