Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36029d800786c3d…

MALICIOUS

PDF

70.3 KB Created: 2021-04-16 01:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 871e485f490e615c5b4e266d495de299 SHA-1: 6ed7845d62280964bbc6a7925185a9038478f8ce SHA-256: c36029d800786c3d02d84502098e04d62bb52e1f3502756a246c521c2edcc662
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, including a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to 'Celebrate recovery step study lesson 13', which is likely a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=celebrate+recovery+step+study+lesson+13 PDF link annotation
    • http://hallhq.xyz/arandano_propiedadesldnmh.pdfIn PDF document text
    • http://kedamijofulufep.mygamesonline.org/didigapelofo.pdfIn PDF document text
    • http://autobaff.xyz/max_weber_sociologiao2iwm.pdfIn PDF document text
    • http://9gusevshop.space/banadewevuzawosatarojhj736.pdfIn PDF document text
    • http://dofujifeluradep.medianewsonline.com/minecraft_guide_to_enchantments_and_potions_free_download.pdfIn PDF document text
    • http://zanodopowe.sportsontheweb.net/32469551713.pdfIn PDF document text
    • http://suvonenexazu.mywebcommunity.org/cadena_alimentaria_definicion.pdfIn PDF document text
    • http://websecurer.tech/45132519819jsrwv.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/what_does_an_itchy_beauty_mark_mean.pdfIn PDF document text
    • http://titoto.xyz/butetagolodidetijx37em.pdfIn PDF document text
    • http://creamwalls.online/how_to_find_bounded_above_or_belowhk36e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c20a02f1-eded-46de-afbf-2d7328e03b26.filesusr.com/ugd/c6fd25_2a5d674bb0454fdd8c49d87be09bafa5.pdf?index=trueIn PDF document text
    • http://seroritubofa.atwebpages.com/psychology_class_11_chapter_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5a73bbb-cbdc-4180-ab17-35bdf7a30b38/formula_for_interior_and_exterior_angles_of_a_regular_polygon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d0122b6-486c-46bf-a1d7-89585712d146/mini_weapons_of_mass_destruction_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea09ac69-4e47-4fe1-9782-b65860f7bbb6/epson_ex3220_ceiling_mount.pdfIn PDF document text
    • https://7d7e9a41-1eea-4c72-a0b8-c0e3d642de37.filesusr.com/ugd/513cfa_98c65bc93e024fcdb11787a74b86f6f8.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_off0000d3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EB 5488 bytes
SHA-256: 34be4760e3d11dd41c8b88f023743abb092c47126afd1bb92d4aa0aa76c61449
font_01_sfnt_off0000e6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AA 10352 bytes
SHA-256: 5170a1d8fe4c15d17f2a125346ae5ac5652e192f638294132cd5ccb5fa951e50

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