Malicious PDF — malware analysis report

Static analysis result for SHA-256 adce4c318a931b39…

MALICIOUS

PDF

74.4 KB Created: 2021-02-28 05:43:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6e77ed842ab8c210d4181f766e5bff77 SHA-1: e8986c53dbd9342aac9ad2a57dac06c4591dcfdb SHA-256: adce4c318a931b3993d31e1000e458b00e3ea347939f5d35fefd3828dbe4ac2a
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external URLs pointing to potentially malicious content. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated to host a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/aws?utm_term=what+is+the+blackest+race PDF link annotation
    • http://peskomment.ru/vefuxarusou3utw.pdfIn PDF document text
    • https://cdn.sqhk.co/lajefage/2NYgfho/birthday_cake_recipe_no_chocolate.pdfIn PDF document text
    • http://xuratalusat.22web.org/58246423882.pdfIn PDF document text
    • http://gufutaca3.xyz/mechanics_of_materials_hibbeler_solur1o7k.pdfIn PDF document text
    • http://markettop.pro/fiche_argumentationnteuu.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/what_stores_sell_live_christmas_treescjjvk.pdfIn PDF document text
    • http://marinarus.space/scag_tiger_cat_2_61_kawasaki_enginefbglu.pdfIn PDF document text
    • http://mon-compte-cmb.best/ladjectif_qualificatif_pithte_exercices9zjfx.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/Hhhb2Vx/super_stick_fight_man_tracing_bomb.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/Gjhigji/citizen_rome_bicycle.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/hdgdia0/doomsday_clock_2020_update.pdfIn PDF document text
    • http://runatem.66ghz.com/back_to_work_song.pdfIn PDF document text
    • https://piwomokoxik.weebly.com/uploads/1/3/5/3/135335333/3205e336668a.pdfIn PDF document text
    • http://repochka.site/pemuli45tqe.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/jhjfPxy/wyze_outdoor_camera_base_station_sd_card.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jemowefodidalo.rf.gd/29610267646.pdfIn PDF document text
    • http://kexasejuwodeji.epizy.com/wimolimapelusujejefutu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 5104 bytes
SHA-256: 8ae142a31f1fc9efd0ec1d270d051c35671127b6cad219f7684e2bc2afd79aed
font_01_sfnt_off0000f908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 10708 bytes
SHA-256: 62c2fe336ec9ef74723c4f519e9324d58c4c8225676bf13b30ed74feb373e86a

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