Malicious PDF — malware analysis report

Static analysis result for SHA-256 40665e17bc23ab58…

MALICIOUS

PDF

76.8 KB Created: 2021-03-24 03:43:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d06d3ea9464e3a545d17d33f32c5e3ba SHA-1: ad402bd43417a6f4bfbc0622b82e737e165d62d1 SHA-256: 40665e17bc23ab58ad93956537d2cd25c17fcffd78232ccf2420d2ee5f63dee8
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a common tactic for distributing malicious content or conducting phishing attacks. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of a link farm suggests the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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 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://zajinet.ru/123?utm_term=intestino+delgado+celulas+caliciformes
    • https://cdn.sqhk.co/zizenozi/jllALlr/7544911248.pdf
    • http://lakuberik.mywebcommunity.org/fusionner_2_fichier.pdf
    • https://cdn.sqhk.co/teketerep/gjdihfA/mugofexidarixifedapoli.pdf
    • http://kaboliwup.mypressonline.com/importance_of_agriculture_in_africa.pdf
    • http://potuxoposutu.medianewsonline.com/el_solitario_horacio_quiroga_resumen_corto.pdf
    • http://gatowixipeba.mywebcommunity.org/autocad_commands_list_with_explanation_free_download.pdf
    • http://mokemowowove.mygamesonline.org/the_most_played_song_in_nigeria_now.pdf
    • https://cdn.sqhk.co/xejudawadoni/icifnCS/strategic_management_textbooks.pdf
    • https://cdn.sqhk.co/bomumuxa/77nQgjp/personal_sticker_mod_apk.pdf
    • http://kemamibuke.mygamesonline.org/lowes_canada_community_grants.pdf
    • https://cdn.sqhk.co/bomoxale/fjcsz61/96145813002.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rowoniwetob.atwebpages.com/cassava_production_in_thailand.pdf
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_0de186483b4a4e93a148f4a6f09936ae.pdf?index=true
    • http://najukelosuned.myartsonline.com/rafepapavejomotizusefedu.pdf
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_14b68b2bdd7d4b27bad39d82093a3b62.pdf?index=true
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_5dabbb6e9e20407cafb16654abab55e6.pdf?index=true
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_53b9e4d4738a496b8e250d7172ddc3ca.pdf?index=true
    • https://s3.amazonaws.com/pirofopafu/25769372841.pdf
    • https://s3.amazonaws.com/mefadedosuw/vogibiziwenitokadevole.pdf
    • https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_5bb519193f0841aca7f189ccc33145c8.pdf?index=true
    • https://235a1a37-2bc9-4d3b-8f1d-d3952ad9fba8.filesusr.com/ugd/3111f7_2f68424536194e8e99a8ac725304ce17.pdf?index=true
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_6d0c02af73ec4d77bcbe67a05a46eb82.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb5.bin
4664d1a8830202a5495db84ee112e4b89d4051ab13ca563dfa9f77aa215ba73a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB5 5276 bytes
font_01_sfnt_off0000ff96.bin
7f9c373efe52197c9b77da4fbfcac61b46650a188cf1e6b37e49d3bea7112056		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF96 11700 bytes

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