Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa3ff7856754dd2…

MALICIOUS

PDF

76.9 KB Created: 2021-02-17 21:25:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: cb1757c556646aef7f7064f9ae7f8b5f SHA-1: b4acb0a770956453336d25d189cc0b3ddb538157 SHA-256: 4fa3ff7856754dd213802832bc8e264930cbe66b7d02240007e3af93bdf54112
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded URLs, such as 'https://jottigo.ru/strik?utm_term=why+does+my+vizio+tv+say+no+signal+when+hdmi+is+plugged+in', are likely used to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=why+does+my+vizio+tv+say+no+signal+when+hdmi+is+plugged+in PDF link annotation
    • https://cdn.sqhk.co/rafujajek/jfgcoo9/zizobewujutewalujum.pdfIn PDF document text
    • https://bugupomulu.weebly.com/uploads/1/3/5/3/135396692/giwiko.pdfIn PDF document text
    • https://cdn.sqhk.co/nifijagik/jcif0lo/king_arthur_s_magical_sword_codycross.pdfIn PDF document text
    • http://reduslim-italia.website/siwurusuvidifuvetojopufitjr5cg.pdfIn PDF document text
    • http://ig-support-service.com/minutes_of_meeting_template_ms_wordxkxwv.pdfIn PDF document text
    • http://ejinaya.com/58078516597fcef5.pdfIn PDF document text
    • https://cdn.sqhk.co/dimosiwela/djghhiT/lodafujiriwulebojovujada.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/W9RlOWq/mystery_trackers_fatal_lesson_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sowovupo/jjethjh/kung_fu_street_fight_game.pdfIn PDF document text
    • https://cdn.sqhk.co/judawube/hcRgjGN/mevajakopesufalolobev.pdfIn PDF document text
    • https://cdn.sqhk.co/dovoxukeni/jjfieAf/the_yellow_cab_number.pdfIn PDF document text
    • http://groby-ritual.online/6080290257338q5b.pdfIn PDF document text
    • http://vodoroding.info/android_studio_system_requirements_cpu7cwfd.pdfIn PDF document text
    • https://sozazajigosana.weebly.com/uploads/1/3/0/7/130739782/kejub-loxoze-bagup-suxavaborut.pdfIn PDF document text
    • https://cdn.sqhk.co/mujetujojen/bBhhCig/66863560995.pdfIn PDF document text
    • https://mapulanedubo.weebly.com/uploads/1/3/0/9/130969056/6711230.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puzexexaniledow.epizy.com/plastic_coated_paper_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/40941631899.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/22634878080.pdfIn PDF document text
    • http://rosuwofa.rf.gd/capacitor_and_capacitance.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/sengoku_basara_ppsspp_android.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_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 5596 bytes
SHA-256: 81916e8d31924333983e27309d1c0ee1ff540d7ae86d4fc918aa901bccb6fc2d
font_01_sfnt_off0001013e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013E 10656 bytes
SHA-256: 53cfbec923fe25e0cecc2d1b5cf15429534ee013c8910b00d14881c684a6d32c

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