Malicious PDF — malware analysis report

Static analysis result for SHA-256 f725cb8d01476869…

MALICIOUS

PDF

94.3 KB Created: 2021-03-15 13:58:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: db1ff6b3088621cec3821d84b0a66100 SHA-1: 3db591b203831b692ec8427ad96f254d6c5b21ec SHA-256: f725cb8d0147686979c8ddfaac417e146f15f31be5bdf3f8d00f9e413cd61968
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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.
  • 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://zajinet.ru/strik?utm_term=tl-wr841n+router+specifications PDF link annotation
    • https://naforuzutexas.weebly.com/uploads/1/3/1/4/131438024/bogotibuwikari.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/ghbh9hi/racing_manager_2014_download.pdfIn PDF document text
    • https://cdn.sqhk.co/futogifoku/0jh77ia/alien_shooter_full_game_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/sawomunuj/L9rFkhi/fiwirezobepo.pdfIn PDF document text
    • https://kifoguwo.weebly.com/uploads/1/3/1/3/131383532/72cec8e486.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/hiQTiaJ/chicken_gordita_crunch.pdfIn PDF document text
    • https://xizenajagixofus.weebly.com/uploads/1/3/4/6/134657686/nomor-bozivugekawa-temadume-kivologawu.pdfIn PDF document text
    • https://cdn.sqhk.co/mezomabesoki/iAghnge/54445515051.pdfIn PDF document text
    • http://xepewifub.mygamesonline.org/wififeradididones.pdfIn PDF document text
    • https://kuruxeronujupo.weebly.com/uploads/1/3/4/4/134477992/mubelenosunogow.pdfIn PDF document text
    • https://cdn.sqhk.co/duzixulok/8heghia/spotify_single_song_android.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/kivarefoxegavowikeb.pdfIn PDF document text
    • http://vomamafawib.scienceontheweb.net/ford_3000_tractor_weight.pdfIn PDF document text
    • http://dizofuses.mypressonline.com/act_practice_test_free.pdfIn PDF document text
    • https://cdn.sqhk.co/sekigizakeku/giuSvHO/37444250037.pdfIn PDF document text
    • https://vurejubi.weebly.com/uploads/1/3/1/4/131454114/xodiviparubu-tofara.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/oFhccia/mini_manager_soccer_world_cup_2019_live.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/hjgihge/teweravolepelotarido.pdfIn PDF document text
    • http://posiximuteg.sportsontheweb.net/52536874762.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vajapojaperusu.myartsonline.com/41447977479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cede612d-3bc6-4bc5-8363-8f0d57445b9d/wodap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75b5ae0a-680a-42ba-a7b6-cb71de143070/how_to_get_trade_options_on_robinhood.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36197231-0030-4b67-9172-9217a108f34d/25238876957.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77F 15892 bytes
SHA-256: a4250bfaccd2e547ae74b436b045fce3e8a209939be7f4c65d8bb30bdb6b98fc
font_01_sfnt_off00012736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12736 5416 bytes
SHA-256: dfdcab4c483972a4c270b5dcad9befe771b0d17f96356ebdd8253309b3943e75
font_02_sfnt_off000139d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D7 16892 bytes
SHA-256: 27d45a302649ec3da5861583ca05b832b0d31b9dfff1f5dc97abfb49f37941e7