Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb246753b8127b3…

MALICIOUS

PDF

76.8 KB Created: 2021-05-19 01:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: acd3f7ee063c4561b0132258a491000b SHA-1: cacc0393d1ac1509cf4e93e6de342c37d239a3f7 SHA-256: 0cb246753b8127b3057c21de786a2434c29a692cd42e32ebeb10b4af12918eb2
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a high-confidence heuristic flagging it as a link farm on disposable hosting, pointing to a malicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/strik?utm_term=introdu%25C3%25A7%25C3%25A3o+%25C3%25A0+administra%25C3%25A7%25C3%25A3o+maximiano+2011+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380088/normal_5fd065d8de5da.pdfIn PDF document text
    • http://baxijemapuzoxu.22web.org/adeptus_ministorum_8th_edition_codex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447669/normal_6011f00343d69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410679/normal_6010b017d3d69.pdfIn PDF document text
    • http://diwokaxojizo.iblogger.org/cadenas_de_markov.pdfIn PDF document text
    • http://zuxegesa.iblogger.org/28565871094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484380/normal_60125d5969447.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411921/normal_6014ccde71583.pdfIn PDF document text
    • http://venovagom.iblogger.org/negative_binomial_distribution_examples_and_solutions.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/kiguteperilodu/cien_aos_de_soledad_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa9e62bf-cedf-4a1f-86af-6717543a2703/disciplines_of_a_godly_man_chapter_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34917953-9645-4fec-971a-696ec09ba4d2/xivakeru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c385f6bf-8ef0-4904-b4a0-94616b2333c8/hp_officejet_6700_printing_wrong_color.pdfIn PDF document text
    • http://zuriromaruwo.epizy.com/zutufitususesusab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa4fb738-b1c6-4702-b788-81531339a4ac/ap_human_geography_chapter_11_agriculture_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/sql_server_2014_sp2_standard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c871ebfb-0063-487c-bb0c-d26a0a793a9d/canterbury_tales_modern_english_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/ponoberorokaxesetikivof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dd56f97-63fa-4f77-a24e-80f4529c2c6a/vivitar_earbuds_instructions.pdfIn PDF document text
    • http://xizokokov.epizy.com/8666485246.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/adrenaline_mob_coverta.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/music_from_soundcloud_with_album_art.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_off0000e88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88D 6220 bytes
SHA-256: 94e548d90ec76e3c50468b58b5b4b0d12f8caed84dace396a05c3bf067f23cc7
font_01_sfnt_off0000fc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7E 13260 bytes
SHA-256: 88fc47e65b32384d423952dcb5e275292ca4b98eba867998c5521b580f88270f