Malicious PDF — malware analysis report

Static analysis result for SHA-256 894157639bda1aa6…

MALICIOUS

PDF

79.3 KB Created: 2021-05-09 06:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b5254edf14a3c5fba0c30459028d268 SHA-1: 5161635eb6f35912c2dff3413d5cc0bcb2355bd0 SHA-256: 894157639bda1aa6395330da55cfe81d14f856ca736a6de09c72c1c5a45c36ca
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect the user to malicious 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://vilenefex.ru/strik?utm_term=the+book+of+sitra+achra+for+sale
    • http://lubenoredeji.mypressonline.com/teguboxu.pdf
    • https://zajewovebuvi.weebly.com/uploads/1/3/0/7/130739158/timobev.pdf
    • https://lidelituni.weebly.com/uploads/1/3/1/4/131452972/gatosenegolov-nezitarup-gudovedeteso.pdf
    • https://cdn.sqhk.co/totafeta/jii9ggI/ants_life_mod_apk.pdf
    • https://tigasedoxopafu.weebly.com/uploads/1/3/4/7/134707490/2798225.pdf
    • https://repawuwo.weebly.com/uploads/1/3/5/3/135313919/bixogoliz.pdf
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/parozuvu-fozovuguk-xijewur-vufetomuzezoxom.pdf
    • https://cdn.sqhk.co/sisalubitot/hYig7FU/block_traffic_noise_in_garden.pdf
    • https://zuligenewem.weebly.com/uploads/1/3/4/7/134749141/2c2b472f.pdf
    • https://cdn.sqhk.co/wodelaganav/iWihhjt/mineral_wells_tx_obituaries.pdf
    • https://cdn.sqhk.co/wokuvaxevaji/gjfFieB/1122820582.pdf
    • http://vijoviresole.mywebcommunity.org/luxenojisojivex.pdf
    • https://dusimajigedavim.weebly.com/uploads/1/3/1/4/131453199/3242770.pdf
    • https://butoxuxesadi.weebly.com/uploads/1/3/4/6/134699311/tizipoteroze.pdf
    • https://werotibumef.weebly.com/uploads/1/3/4/9/134900185/5be5f9d98.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dolinoko.atwebpages.com/general_zoology_free_download.pdf
    • http://kavuduvolilazod.myartsonline.com/certificate_sample_download.pdf
    • https://uploads.strikinglycdn.com/files/500091ba-094c-4384-ba7a-debd5a6e0760/how_to_check_a_furnace_ignitor.pdf
    • http://jusopetikikij.onlinewebshop.net/hungry_howie_s_nutrition.pdf
    • https://uploads.strikinglycdn.com/files/6a0530e5-1bcc-4e67-8d16-5a00a70c3b9d/partituras_lldm_2018.pdf
    • https://uploads.strikinglycdn.com/files/0be7d0b2-518a-4807-8ad7-296d0efac2d7/what_age_is_ahsoka_in_clone_wars.pdf
    • https://uploads.strikinglycdn.com/files/422f786b-1ba5-4dce-92a9-9381362ae554/what_emojis_do_guys_use_when_they_like_a_girl.pdf
    • 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_off0000f881.bin
522b8137da92eb4bfeae4a28a7974afa72214cdb6f644287cc3433efa1747d07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF881 5120 bytes
font_01_sfnt_off000109e4.bin
cf19814f9fa7a9a80fb4071f9df8ff38125c9f473342715f46b73c7abf5650e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109E4 10548 bytes

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