Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed23294306a889f3…

MALICIOUS

PDF

76.2 KB Created: 2021-02-26 04:58:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3f05783dd6a9bfd9b3efb71cfd96acca SHA-1: afac5d17670454333d680b3d5c207f41c2d75c4a SHA-256: ed23294306a889f348b3273fe24c8e3e090ecc616af3c9294a17c840f2dee409
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The primary attack pattern involves directing users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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://druttle.ru/award?keyword=audio+technica+lp60+bt+review PDF link annotation
    • https://kukibutojiw.weebly.com/uploads/1/3/0/7/130775835/lifuwopobu.pdfIn PDF document text
    • http://netlysy.online/personalized_blank_sheet_music_bookcyppw.pdfIn PDF document text
    • http://in-step.shop/56462710845qapih.pdfIn PDF document text
    • https://cdn.sqhk.co/sagitusat/hcBggE6/emergency_pediatric_dentist_charlotte_nc.pdfIn PDF document text
    • https://cdn.sqhk.co/siviraboriru/jjbiaQj/memim.pdfIn PDF document text
    • https://cdn.sqhk.co/fusojafiza/hihiUUB/jump_switch_basketball.pdfIn PDF document text
    • https://bosizeke.weebly.com/uploads/1/3/4/5/134596703/8465084.pdfIn PDF document text
    • https://cdn.sqhk.co/mogilirexexa/6ghoicR/super_mario_bros_snes_emulator_online.pdfIn PDF document text
    • https://zinegekoxemajaj.weebly.com/uploads/1/3/4/7/134767253/edf8bfa122a499.pdfIn PDF document text
    • https://rupijike.weebly.com/uploads/1/3/5/3/135312351/981565.pdfIn PDF document text
    • https://judunuxazivu.weebly.com/uploads/1/3/1/4/131453245/970b8.pdfIn PDF document text
    • http://front-glass.website/a_court_of_thorns_and_roses_book_4_summarysuquq.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/hjjjjjy/race_car_track_in_kansas_city.pdfIn PDF document text
    • http://arthromedshop.xyz/81711565519bj4sw.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/cLjjjiE/real_likes_and_followers_for_instagram_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dorenibe.rf.gd/narrative_essay_planning_sheet.pdfIn PDF document text
    • http://bozalusi.epizy.com/vipelenikiguvevefimigi.pdfIn PDF document text
    • http://filamejukak.epizy.com/amba_shambhavi_ringtone.pdfIn PDF document text
    • http://javisan.epizy.com/command_and_conquer_tiberium_wars_apk.pdfIn PDF document text
    • http://rovofupokunuda.rf.gd/dragon_age_inquisition_character_creation_guide.pdfIn PDF document text
    • http://lowoxewepabetex.rf.gd/selenium_webdriver_javascript_automation_for_beginners_2019.pdfIn PDF document text
    • http://magikid.epizy.com/78973460298.pdfIn 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_off0000f50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50C 5560 bytes
SHA-256: fd5af18e600827c72fc80c410256c6cbcd4eeebb5943bdc3624b437a25c8bbb2
font_01_sfnt_off000107f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F7 10676 bytes
SHA-256: c53f4d82c7e4897a9fb57415b8b1155d083f41db99e04fe0252fd5c3a22085ad

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