Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3c0c4d25fb056f…

MALICIOUS

PDF

110.3 KB Created: 2021-06-05 06:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3ea79e07d5442dec0f4675205cdf38e8 SHA-1: d76ac0971acc676df115b38e1d27294626f12252 SHA-256: ac3c0c4d25fb056fb6e3412d8e85e36a49f5a2dd49ba3e2fe59506b047877ae2
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a large number of embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or spam distribution tactic. The presence of external URIs and the overall structure strongly suggest this document is designed to redirect users to malicious websites, likely for credential harvesting or malware distribution.

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
  • 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://maypoin.ru/123?utm_term=alveoli+combining+form PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385231/normal_606e078da616f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495241/normal_603b7a95ed023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421330/normal_5fe9a7e8cc024.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4366987/normal_60aff88696c97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417123/normal_5fcf3be5cb0b5.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4481273/normal_60b486ad4b759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424013/normal_60b82fb137278.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464053/normal_5fedfda5e1106.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496577/normal_5fcb7bbd0dfc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475570/normal_5fe93dfe1a101.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/902ebe32-cc0d-4434-a330-03320b5bfba1/55063509218.pdfIn PDF document text
    • http://zorisomofi.pbworks.com/w/file/fetch/144554517/fabidejojigiwibupunev.pdfIn PDF document text
    • http://lifelekufa.pbworks.com/f/gibupeje.pdfIn PDF document text
    • http://minuwaxiper.pbworks.com/w/file/fetch/144631086/47138341238.pdfIn PDF document text
    • http://wuwazilizos.pbworks.com/f/four_quadrant_ordered_pairs_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11f5599b-24bd-4336-a773-9cbc47344fdb/35276642194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d071897-054e-457f-9470-b35895950444/how_to_change_lg_tv_screen_size.pdfIn PDF document text
    • http://tekitejug.pbworks.com/w/file/fetch/144541656/58241942309.pdfIn PDF document text
    • http://natofuke.pbworks.com/w/file/fetch/144623082/garozogejutumevofixat.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/what_is_the_concept_of_personal_selling.pdfIn PDF document text
    • http://zegugas.pbworks.com/f/apple_mac_pro_a1398_charger.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/w/file/fetch/144469263/what_is_class_rank_mean.pdfIn PDF document text
    • http://nikekuva.pbworks.com/w/file/fetch/144597618/need_for_speed_most_wanted_2_rar_ifresi.pdfIn PDF document text
    • http://gajufabeke.pbworks.com/w/file/fetch/144423030/51314251382.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/w/file/fetch/144632061/naruto_ultimate_ninja_heroes_3_mod_apk.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_off00016f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F3A 5004 bytes
SHA-256: d004e02b23a4eae2654a06723f24a0c3c20358fa9c2ba8ef7113d2f4ff1813fe
font_01_sfnt_off0001803e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1803E 12664 bytes
SHA-256: 76dd72231e8a2a93471c9ea0aba5302f7e57add1fbc54b2fd9f6f7ad835b43ed