Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f917d00c1a3d666…

MALICIOUS

PDF

79.0 KB Created: 2021-05-07 05:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 17f7ca11b70ad6aece3e3ee96afb7ffc SHA-1: 90b30d885b1c4d2d9530e338a97458dce63483ce SHA-256: 8f917d00c1a3d666291e0176deefb3d50378e9d3bbe1da2595fc17dc6214d2cb
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://mezovuduw.ru/strik?utm_term=skyworth+40+led+tv+review PDF link annotation
    • https://gunobapeve.weebly.com/uploads/1/3/4/7/134706327/juronanabasi.pdfIn PDF document text
    • https://jaxifojuw.weebly.com/uploads/1/3/5/3/135351184/8269011.pdfIn PDF document text
    • https://rurujopolobadez.weebly.com/uploads/1/3/4/4/134444805/1290665.pdfIn PDF document text
    • https://rakatifuz.weebly.com/uploads/1/3/5/9/135964199/6427318.pdfIn PDF document text
    • https://wazalopa.weebly.com/uploads/1/3/0/8/130814586/folesa_tofipolag.pdfIn PDF document text
    • https://tupirusu.weebly.com/uploads/1/3/4/7/134702138/574ca.pdfIn PDF document text
    • http://mojadejazisapa.sportsontheweb.net/kindle_paperwhite_users_guide_17th_edition.pdfIn PDF document text
    • http://povisowalikim.scienceontheweb.net/alejandro_dolina_cuentos.pdfIn PDF document text
    • https://wutekeli.weebly.com/uploads/1/3/1/3/131379380/donusoso.pdfIn PDF document text
    • https://fowinojosusine.weebly.com/uploads/1/3/4/4/134495991/mefakebudugasap_wojaba_nijide_bejagazutozipe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_c0c81daccf87450a9c394d02911b0c94.pdf?index=trueIn PDF document text
    • https://a2d2c786-a255-4d30-aaac-3df02bc54f47.filesusr.com/ugd/c345b0_f8479509abf044dfb8e619fcd668d89c.pdf?index=trueIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_8ef01c315d074c0ab24173c50869ac55.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mukutud/kalinda_and_lana_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/why_does_it_hurt_to_touch_your_belly_button.pdfIn PDF document text
    • https://764dfaed-7091-4b1c-a8ff-ceb5b694923f.filesusr.com/ugd/4bafdb_26fb45d8f2ed49c0b795e653ca3c38c8.pdf?index=trueIn PDF document text
    • http://lobulowigewimu.epizy.com/don_t_panic_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/lavujukofi.pdfIn PDF document text
    • http://kegunujav.epizy.com/emulator_gba_ios_apk.pdfIn PDF document text
    • http://lugenizuridaj.atwebpages.com/dk_german_english_visual_bilingual_dictionary.pdfIn PDF document text
    • https://69b12d55-863e-458e-a545-ad358ed6bd1a.filesusr.com/ugd/a9642c_a579ea5c5bd04ee2893c78789c84ec7d.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE117 5176 bytes
SHA-256: 7d2340b70d7c739c2f9f8d72e5d134705afe4c6a0b1bc53b1d0e5a3fc767884a
font_01_sfnt_off0000f2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D7 11500 bytes
SHA-256: 4996b1024a10f65eb76ff0d21c117d589cd137f3b61dd408c47c2b788e005177
font_02_sfnt_off000119a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A0 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3