Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4ad5646d8def96…

MALICIOUS

PDF

76.8 KB Created: 2021-03-25 17:27:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7466556cea1e9825865b9e9c1cb025fc SHA-1: 2e05f3e05f8d0e4e055ddbde8d7266e250088a03 SHA-256: ef4ad5646d8def9631dc032558908dbabbe9de627a6e78a1fad74b8a3c8f7dc8
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to disposable or suspicious domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and link farm heuristics further supports a malicious intent to redirect users. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://ponafet.ru/strik?utm_term=chicco+nextfit+convertible+car+seat+safety+reviews PDF link annotation
    • http://olx-delivery.cc/what_tools_use_dewalt_batteries6imqc.pdfIn PDF document text
    • http://purpless.vip/655872440652w7q6.pdfIn PDF document text
    • http://kinoxca.xyz/vabolimaxatun3o3ft.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/hjiiCic/square_footage_exterior_painting_cost.pdfIn PDF document text
    • http://j3vnci4.xyz/afghanistan_warub3zm.pdfIn PDF document text
    • http://lynciguest.com/2003_jeep_liberty_sport_wheel_sizegtzzn.pdfIn PDF document text
    • http://spindlndou.space/nice_guidelines_hypercholesterolemia6h539.pdfIn PDF document text
    • https://cdn.sqhk.co/lagidexetin/6xYJhbR/56602520323.pdfIn PDF document text
    • http://walletelectrum.buzz/dove_bagnoschiuma_formato_famigliazw475.pdfIn PDF document text
    • http://cybety.xyz/christmas_song_lyrics_bookkb1fr.pdfIn PDF document text
    • http://godevibusaxinoj.22web.org/55171955666.pdfIn PDF document text
    • http://e-devletodeme.net/9046247788idhet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cd8324a-2dfc-4f9c-9425-ff0bab362f71/danasokomumumi.pdfIn PDF document text
    • http://lidiremuvuzanas.rf.gd/your_name_date_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df98759c-f130-42b6-891d-d2c205699a00/zoxiwikikojelofudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d603da8d-6043-47a3-bc5b-259224a52e22/how_to_implement_policies_and_procedures.pdfIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_aec33a692dd049f4b0a99ab62cbd907b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb422cc4-fe78-4441-a53f-9045648fb45d/zujixajifaluri.pdfIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_19435cf6841641ae9e0b7cbed068bf27.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_off0000eef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF5 5336 bytes
SHA-256: b8d0863e877409f62a13e12cb96abb385fe118f90e687b1c3d98abe0484486f0
font_01_sfnt_off00010134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10134 10632 bytes
SHA-256: 2abb8afcfee9e537b92b0364af20bc01f89571fb8e12991e456c9f870cad07d2

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