Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3d443def8f90ad…

MALICIOUS

PDF

82.6 KB Created: 2021-03-19 15:41:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 335cbee8b3990490a7644317f7103bc3 SHA-1: e2d2deae4a56f3a11628a8b296d2c32d908aee8c SHA-256: 6f3d443def8f90ad3f68626b4bccb322273dba78ff7390d0606907fb4a01f5f6
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content or phishing sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this attack pattern. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=young%2527s+modulus+of+steel+si+units
    • https://cdn.sqhk.co/mugetawelumi/PGmPjbq/desetebowevuku.pdf
    • https://foduvixet.weebly.com/uploads/1/3/4/4/134498725/c1953b0d6d3de7.pdf
    • https://vowevabejera.weebly.com/uploads/1/3/0/7/130775986/af1966107a.pdf
    • https://sanepawoja.weebly.com/uploads/1/3/4/5/134579143/teginetibekatux_gokokejutep_dudozeravo.pdf
    • http://pekokaxa.22web.org/what_does_dry_mean_on_my_portable_air_conditioner.pdf
    • https://loropigofog.weebly.com/uploads/1/3/4/5/134595907/reniputolukife.pdf
    • https://cdn.sqhk.co/gidagolusi/NjcUii2/police_car_alarm_sound_download.pdf
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/2991001.pdf
    • https://cdn.sqhk.co/vixuzemabad/iHheBty/85520674350.pdf
    • https://ritulamilogukez.weebly.com/uploads/1/3/4/8/134864073/fodak.pdf
    • https://cdn.sqhk.co/nurijodefa/iePgg0L/74334398112.pdf
    • https://jeduwenerapowi.weebly.com/uploads/1/3/4/6/134678879/2039724.pdf
    • http://zivemigidefis.mypressonline.com/2559060434.pdf
    • http://nebofonuve.mywebcommunity.org/obd_ii_cannot_connect_to_ecu.pdf
    • https://vojoritus.weebly.com/uploads/1/3/1/1/131164067/5307248.pdf
    • http://zixudivibudizu.scienceontheweb.net/aprendizajes_clave_biologia_primer_grado_secundaria.pdf
    • https://zugatesek.weebly.com/uploads/1/3/6/0/136082504/dufato_podidos.pdf
    • http://jujovobima.getenjoyment.net/admirvel_mundo_novo_minhateca.pdf
    • http://rolapisi.scienceontheweb.net/56995144314.pdf
    • https://cdn.sqhk.co/wevafofed/btmjehc/redemption_cemetery_embodiment_of_evil.pdf
    • http://gebikomuxe.getenjoyment.net/exercice_corrig_algorithme_les_tableaux.pdf
    • http://kivolugog.mypressonline.com/wezasalogeraxulinudofatel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wivufaw.epizy.com/domazebizibuvaro.pdf
    • http://jenizigigeno.epizy.com/plague_inc_black_death_guide.pdf
    • http://rixibedi.onlinewebshop.net/carb_cycling_vegetarian_meal_plan.pdf
    • http://zuzimekot.rf.gd/ages_and_stages_questionnaire_36_months.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f87f.bin
10e4b130b12905f52b98ebd3b04de01ce6f2501222c171eed94f8cd183320807
pdf-font-stream PDF embedded font (sfnt) at offset 0xF87F 2876 bytes
font_01_sfnt_off000102be.bin
05435ad635f1afeb5abe479c81381af7c9622b95e092ac12eb1524267f25c3c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 4916 bytes
font_02_sfnt_off00011379.bin
7ed802d0e295604843c29fac07a39cbeee509802f646fbfc12ef7f826e3bcd6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11379 12000 bytes