Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de3886be30b4e55…

MALICIOUS

PDF

79.6 KB Created: 2021-04-29 14:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e7bc2139b6db1f7ccede9a661f2d8cbe SHA-1: 24c97f3cfc1f33cb79ba92bb2f49a1e4ccb0df77 SHA-256: 1de3886be30b4e550eccd95977e038d27c7d31b003c492b11388e0e0d92eef59
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document is classified as malicious, exhibiting characteristics of a phishing and potential malware distribution lure. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a fake browser update or extension, a common social engineering tactic. While no scripts were directly extracted, the PDF structure and link farm suggest it may exploit PDF vulnerabilities or redirect to malicious sites that host further payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://botokaw.ru/strik?utm_term=microsoft+word+table+of+contents+not+updating+page+numbers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490735/normal_6043ed904b694.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/iasReOT/us_divorce_single_parent_meet_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wememiguw/LOxieVh/hearthstone_deck_tracker_battlegrounds_heroes.pdfIn PDF document text
    • https://cdn.sqhk.co/dadirowuj/hc2kIjc/jefarulagatuziji.pdfIn PDF document text
    • http://jakartapro.xyz/the_importance_of_being_earnest_movie_online_freeul9ff.pdfIn PDF document text
    • http://bugarul.22web.org/que_es_acalasia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382613/normal_605f873dbd220.pdfIn PDF document text
    • https://mexarufuwusa.weebly.com/uploads/1/3/4/5/134599415/2809e7b79d36e4.pdfIn PDF document text
    • https://nusewumu.weebly.com/uploads/1/3/2/7/132740482/lexekexaxosovuraj.pdfIn PDF document text
    • http://axecheat9.xyz/xirabejano0den5.pdfIn PDF document text
    • https://tesujirigagorin.weebly.com/uploads/1/3/4/8/134869290/wixapusitevu-lukukig-bevuzari-zexuvitosef.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/S1eKQha/63946666796.pdfIn PDF document text
    • http://fruitik.space/stock_market_books_2020upc9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379626/normal_60642ed4c8211.pdfIn PDF document text
    • https://cdn.sqhk.co/lutakakijuro/kijeUG9/dugiravora.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/fjikhj4/seven_letter_words_starting_with_pre.pdfIn PDF document text
    • http://zuvixomajav.22web.org/antibiticos_en_odontologia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504839/normal_605039c1dae3a.pdfIn PDF document text
    • https://cdn.sqhk.co/jojevirelo/d5d1oid/among_us_wallpaper_red.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420019/normal_6057b2ad1dcc6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://peronilekovo.rf.gd/amravati_district_information_in_marathi.pdfIn PDF document text
    • http://zijaxana.rf.gd/effective_meeting_agenda.pdfIn PDF document text
    • http://webitidekoda.rf.gd/86977184435.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_off0000ea48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 5592 bytes
SHA-256: 6a67449eb9dde19b0f07f38e6e078ee9b643c2b4ad0d3a868c7e773a028a35b7
font_01_sfnt_off0000fd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD46 11040 bytes
SHA-256: c2d8d7e396b58c6b7bbdedef6fe539f66fc3c34ed9b6a267c7bfefeebbac008a
font_02_sfnt_off00012274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12274 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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