Malicious PDF — malware analysis report

Static analysis result for SHA-256 d986038f36f0172e…

MALICIOUS

PDF

76.1 KB Created: 2021-02-22 08:16:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4016d456c84593af1b2de3b6a816b5a0 SHA-1: d68ffa1e0be7e7b4ff8729a547ef5539f96a7246 SHA-256: d986038f36f0172e413eaf16b2c892b97b9e5c0f1d3e300b857e578bb1a3bb5e
186 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, a technique often used for SEO manipulation or to distribute malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The presence of numerous links on disposable hosting further supports a malicious purpose, likely to redirect users to phishing sites or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://leonvi.ru/123?utm_term=the+100+tv+show+vs+books PDF link annotation
    • https://cdn.sqhk.co/noxibogalu/dmIezhA/i_am_warrior_and_this_is_my_song.pdfIn PDF document text
    • https://cdn.sqhk.co/nitunoda/WHkqbie/wastickerapps_store_personalized_sticker_makers.pdfIn PDF document text
    • https://cdn.sqhk.co/wetewajaba/gciGjc5/2d_vector_animation_tutorial.pdfIn PDF document text
    • https://tagudosalanuku.weebly.com/uploads/1/3/1/4/131452811/852421.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/hfidhi0/vertigo_epley_maneuver_at_home.pdfIn PDF document text
    • https://cdn.sqhk.co/dutedape/ggjgjhR/15911002256.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/6gjEgjj/gluten_free_pancake_recipe_oat_flour.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/64b1b66c0799ee.pdfIn PDF document text
    • https://cdn.sqhk.co/butexuvokufo/eAnfeZl/csr_classics_hack_apk_download.pdfIn PDF document text
    • https://rusekawavupor.weebly.com/uploads/1/3/4/0/134096427/kovotamewomejos.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/cHhQeii/jatixixojuj.pdfIn PDF document text
    • https://cdn.sqhk.co/daborofus/duBhcnU/wallpaper_hd_for_pc_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kolusugego/SgeBOzB/video_calling_online_free_no_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gusizozubamu.epizy.com/mufimafirelu.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/pinzamiento_tibio_astragalino_anterior.pdfIn PDF document text
    • http://piperopire.rf.gd/tidobaviboderabafi.pdfIn PDF document text
    • http://fusuzuveraku.epizy.com/formation_carreleur_cours_du_soir_bruxelles.pdfIn PDF document text
    • http://kubazemaxem.epizy.com/chori_chori_full_movie_hd_1080p.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/gofefiboneputolepa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 4568 bytes
SHA-256: d07626dba6478fbd0d27350db6eee1ee935bf6f855c996a36399f1b54ea665bf
font_01_sfnt_off0000f082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 10772 bytes
SHA-256: b9f6e11c357c55417b1025893dc1d8a76f96561103f5ae0ca8a232ebdd69ae47
font_02_sfnt_off000114e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E5 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34