Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bbfd7cc124cb80…

MALICIOUS

PDF

116.3 KB Created: 2021-05-08 06:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5d1d639eb80fbd729bed9a19552c5adb SHA-1: 7f1a49489cc71e00a37dbe6ab707cb5bfbb0f97b SHA-256: b4bbfd7cc124cb80820b18e106178fa31b2e7913f3d8f277663522e408491273
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the PDF structure and embedded URLs are sufficient indicators of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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://dafemum.ru/strik?utm_term=emotional+agility+susan+david+quotes In PDF document text
    • http://svoylend.xyz/77961957372l1qvl.pdfIn PDF document text
    • http://baliferifopiz.mypressonline.com/seminar_report_on_pre_engineered_buildings.pdfIn PDF document text
    • http://pikufufunuti.scienceontheweb.net/godman_additional_mathematics.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/isRgfgh/92319152693.pdfIn PDF document text
    • https://cdn.sqhk.co/lokabawopup/eSjfGjf/mebuxovaminevakoxakabij.pdfIn PDF document text
    • http://price-list.moscow/99861011915ur5lq.pdfIn PDF document text
    • http://leopolds.space/jutosuvufawebozuweporetou3ecr.pdfIn PDF document text
    • http://formulamoney.top/bizuvewuvoowknf.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxejelun/1tKihhd/best_cyber_monday_deals_amazon_canada.pdfIn PDF document text
    • http://cashbackmoney.info/how_to_learn_sap_abap_easily6f4z2.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuzigup/hriajeW/lavender_s_blue_sheet_music_piano.pdfIn PDF document text
    • http://nigemutekilum.mypressonline.com/free_printable_blank_bingo_cards_for_teachers.pdfIn PDF document text
    • http://xiwupulo.medianewsonline.com/berliner_platz_a1_testheft.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/83418afa-0fd5-4e1b-a314-78f6562098ee/what_is_seasonal_working_capital.pdfIn PDF document text
    • https://e714dd98-3e42-4604-aba1-6d4b2506b1a8.filesusr.com/ugd/742965_6ab3832b07c24ced837890661df1fa64.pdf?index=trueIn PDF document text
    • http://suxudogakol.myartsonline.com/pneumocystis_carinii_pneumonia_treatment_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae1bfc27-a24c-462c-be0d-6f85393c9c64/jazapapijosunaribu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d040dae8-03d3-436d-a0f9-00d8f5836dcc/nafazumolotozotofalijota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bd9ec41-07a2-49dd-ade1-0a76e2fe8982/wapilojopekupad.pdfIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_cd9abe5ddebd4824a092d72102b8259d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca5659d0-e682-4de2-8ca2-3d0c916c3647/23845437871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d579251-4991-4743-9022-f4b091990d14/under_the_dome_series_3_episodes.pdfIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_5e4709f7155e4dc9ac15e59df7d76bda.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_off00018ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AD3 5292 bytes
SHA-256: 1bbe0b1195f344dc5c2e87b01ee490aa238fdc530ae7ee434df34d73e02b4198
font_01_sfnt_off00019cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CC9 11304 bytes
SHA-256: 9a56d6bc4d709f42ba411c3e38e646d77451374cb87da0892bdfb0e6ebf6537c