Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32a1cad5d98851a…

MALICIOUS

PDF

74.1 KB Created: 2021-04-10 05:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 254c0c9ba0d0df5cd6fe8ea4b8c0f0c5 SHA-1: e583adaa7446a96336699956f362680712ee074c SHA-256: c32a1cad5d98851a7f0d07902523b54471ba93f3211979b2d4a3023fabe26351
244 Risk Score

Malware Insights

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

This PDF document is classified as malicious, containing numerous embedded links designed to redirect users to potentially harmful websites. The heuristic firings indicate it acts as a link farm, with at least one URL pointing to known malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lead users to phishing or malware-hosting sites, likely as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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/strik?utm_term=human+resource+management+pdf+lecture+notes In PDF document text
    • https://dimalosuzilem.weebly.com/uploads/1/3/1/4/131452887/7237272.pdfIn PDF document text
    • https://ralutadepijug.weebly.com/uploads/1/3/5/3/135305627/totedoditigilot-kekokobe-mowixavodek.pdfIn PDF document text
    • https://wisejagu.weebly.com/uploads/1/3/4/8/134881465/d1da8ee699dfcc9.pdfIn PDF document text
    • https://cdn.sqhk.co/woselukafo/bjjJUhb/jonerepotota.pdfIn PDF document text
    • https://cdn.sqhk.co/zifalulog/gi0ojgg/espn_fantasy_baseball_playoff_tiebreaker.pdfIn PDF document text
    • https://sotemupavunu.weebly.com/uploads/1/3/1/4/131413148/wokuniganure_lelid_gejibiz_sifiwezirepuk.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/fkidSgh/sling_kong_all_kongs.pdfIn PDF document text
    • https://falogumirej.weebly.com/uploads/1/3/4/3/134368081/a9d9fe981.pdfIn PDF document text
    • https://pabarubuvu.weebly.com/uploads/1/3/1/3/131379718/2186755.pdfIn PDF document text
    • https://kunexiravirub.weebly.com/uploads/1/3/5/3/135344507/9526466.pdfIn PDF document text
    • https://cdn.sqhk.co/woxiwovar/hjjjOib/painting_with_a_twist_colorado_springs_events.pdfIn PDF document text
    • https://cdn.sqhk.co/jututumogu/didRkhe/naturalizer_sneakers_outlet.pdfIn PDF document text
    • https://ramipataxeki.weebly.com/uploads/1/3/4/4/134483057/5747487.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fofeguj/cartoon_photo_editor_app_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5ac2af0-43a1-4c7c-9676-53406b7dd578/im_not_perfect_girlfriend_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/julipezasumofetaloba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c55a7bbe-2493-4191-a2b0-e12125ddc081/66968516675.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/baptismal_class_manual_sda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af1fed34-e625-4e6c-bdd3-c877ad2b6af8/71599018830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0af46b5c-dc85-4bb7-80b6-fdb49116ae3d/xbox_360_disc_tray_keeps_ejecting_itself.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dccbb13-1f62-49ed-9b30-d2259e87e495/34979952621.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_off0000e476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE476 5436 bytes
SHA-256: 4dbc0208d716a292027b1633c9e2d07ca80d08000b3e0d5142c5fdee256b1887
font_01_sfnt_off0000f6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D6 10340 bytes
SHA-256: ae2dcd9f9e2f560f2510962116ffee8890516a127ffeadb61105eff37ca6acc9