Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0814ee1b258ce94…

MALICIOUS

PDF

82.8 KB Created: 2021-05-09 05:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 845ddf9342044d788210059802097ede SHA-1: d9e8bf9338ceb7eee751bbb0a4adb06f9e82c917 SHA-256: d0814ee1b258ce94a32d9049db9f78f81ef8bfac0a296f0d798a2a65376f1dca
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The primary external URL points to a domain that appears to be involved in malicious activity, and ClamAV detected it as a phishing trojan. The document body, though heavily obfuscated, contains text related to search queries, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vilenefex.ru/strik?utm_term=what+does+a+flashing+red+light+mean+on+a+carbon+monoxide+detector PDF link annotation
    • http://zakewabo.scienceontheweb.net/employment_news_weekly_knowledge_philic.pdfIn PDF document text
    • http://lukiduxipapep.mywebcommunity.org/falalolebepar.pdfIn PDF document text
    • http://tuxesimufimiti.mypressonline.com/zugozip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://birukuf.onlinewebshop.net/blackbody_radiation.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/ipcc_2019_date_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/720dfc8e-ae6c-4fd9-a830-3223a09888f3/kiperovuremaxomi.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/valse_d_amelie_piano_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b95e1b43-306d-421a-9bff-280005158e75/kebonevaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/102db713-18e3-479c-8b73-8bbad328ea23/nezatamomesafuwasujuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba0f0fc3-35b4-4472-869c-974bb86a43a5/how_to_tell_if_your_dog_is_a_dachshund.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/31762115314.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d95e44e9-a53e-4b56-9a5e-ff8982f770cc/59539798367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59a956ce-becd-405a-b003-be94d59c4f14/bepuzolowoje.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/apex_launcher_pro_apk_free_license_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c981368-bb46-47cf-9a42-395364302ff3/cien_anos_de_soledad_first_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7cb8dda-cdfa-481a-b0dc-c91e150fb85c/59234710362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4fc99e7-ab08-4671-8d53-39eeb51cc8c7/wimekosefosabim.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/sivovodogepijetosawopalad.pdfIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_d55a42f3b2d04890b5e6f14158ac0120.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5706493a-dd34-418f-82cf-0061f95cd0cb/48493379515.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/what_did_stuart_wilde_die_of.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7119267-a5df-4831-bb84-d9974c3ffbf0/simple_math_word_problems_1st_grade.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_0386eba3ecca4545a6534795a8152d3b.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10267 5656 bytes
SHA-256: 11a1339e11089681625efbb65e2d545306b22eeb0d56c3cffc67090891e80def
font_01_sfnt_off0001158a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158A 10972 bytes
SHA-256: 4b4dc613dcf4f8017fb03bc151ae8a08a3a07075a06be4c319dd4504bd051463