Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7258766fc3ce3a…

MALICIOUS

PDF

88.3 KB Created: 2021-02-23 21:42:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3e4097ce94c78d3276fe156c8082f242 SHA-1: 07de6b0333a39f3fe55645e94acfe8e05b001c5e SHA-256: fb7258766fc3ce3a316c9548f638dfb3f11d8aabaf20d761195c2cc00f373333
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains a large number of embedded links, many pointing to disposable hosting services, indicating a link farm or phishing attempt. One critical heuristic identified a link to known malicious redirector infrastructure, further supporting a malicious intent. The ML classifier and ClamAV also flagged this file as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=does+total+gym+platinum+fold+up In PDF document text
    • https://kaxamutibe.weebly.com/uploads/1/3/5/3/135348628/kupumefuvalum.pdfIn PDF document text
    • https://bunafigokakataw.weebly.com/uploads/1/3/0/9/130969192/mijofe.pdfIn PDF document text
    • https://kinefevemupopit.weebly.com/uploads/1/3/4/6/134631160/923e94328b9892e.pdfIn PDF document text
    • https://wogizirimabote.weebly.com/uploads/1/3/5/3/135337148/c50f8d480fc.pdfIn PDF document text
    • https://numetigovav.weebly.com/uploads/1/3/1/6/131606493/jemupevorut-pidugufomuwekat-tirawi-lorarexidojo.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/jfZjglG/amazon_board_game_deals.pdfIn PDF document text
    • https://milikosepawina.weebly.com/uploads/1/3/2/6/132696406/bed6ffc9a.pdfIn PDF document text
    • https://zisetilu.weebly.com/uploads/1/3/1/3/131382786/6677513.pdfIn PDF document text
    • https://katifakemu.weebly.com/uploads/1/3/1/3/131381151/zazavij-wibalamitekef-vizomufan-pukajibewadekez.pdfIn PDF document text
    • https://luzulobopado.weebly.com/uploads/1/3/2/6/132681737/zoxuwakilemenin_giwiremuguve_wosijudekitiv.pdfIn PDF document text
    • https://takatika.weebly.com/uploads/1/3/4/6/134605824/6090144.pdfIn PDF document text
    • https://kajipeluvo.weebly.com/uploads/1/3/4/3/134318391/4160938.pdfIn PDF document text
    • https://cdn.sqhk.co/xokebuzizo/iehcxff/new_english_song_2020_mp3_download_pagalworld.pdfIn PDF document text
    • https://wogalipa.weebly.com/uploads/1/3/4/3/134316604/8851750.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/ehdjghb/offroad_hilux_pickup_truck_driving_simulator_mod_apk.pdfIn PDF document text
    • http://vasamekekegu.iblogger.org/usa_lottery_application_form_2018.pdfIn PDF document text
    • https://ximabetewu.weebly.com/uploads/1/3/1/3/131384229/6937204.pdfIn PDF document text
    • https://resawipodejevi.weebly.com/uploads/1/3/0/8/130814711/molimaruwikus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bonizeza.epizy.com/didunipel.pdfIn PDF document text
    • http://sukidagijonola.rf.gd/48384728561.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11173 5364 bytes
SHA-256: 4fd2fb9a4b3a1438afc803734bf67b84319e43adafa6a9177a4178923cf7c8a7
font_01_sfnt_off000123b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B4 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off00012f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F17 10696 bytes
SHA-256: 912609ed9abc06537c1196688708c9acb073ee4292251c77ca24cdded7ae4131