Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e2855515ccbed09…

MALICIOUS

PDF

78.2 KB Created: 2021-04-25 21:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 641005c68c7459bd1447ccd08d3b9a24 SHA-1: 5b246541049d659876ce320196fe8b2fcad2aaac SHA-256: 1e2855515ccbed09ff667c00aed5f1d5fb6af8d055cccfac80466ba23748b7a2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=how+to+run+5k+training+plan PDF link annotation
    • http://websporizlehd.com/tugafonotevaliviforibiig5bs.pdfIn PDF document text
    • http://interbankdigital.com/how_to_identify_flower_seedsemjtp.pdfIn PDF document text
    • https://kopomitesukov.weebly.com/uploads/1/3/1/4/131453216/1770061.pdfIn PDF document text
    • https://teseresoj.weebly.com/uploads/1/3/4/6/134644138/bixan.pdfIn PDF document text
    • http://obmenkalnr.online/tumatubomebopudamudak1uwvd.pdfIn PDF document text
    • http://batmbatm.ru/lilegadirasijatir9lbr.pdfIn PDF document text
    • http://summerita.fun/98929856345q6do0.pdfIn PDF document text
    • http://youralteragoods.com/whirlpool_washer_troubleshooting_manual6r98p.pdfIn PDF document text
    • http://jonotijero.medianewsonline.com/sownik_prawniczy_angielski.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457854/normal_605323778e780.pdfIn PDF document text
    • https://nolujamikudaze.weebly.com/uploads/1/3/4/8/134868466/tokoki-kadufijofo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379618/normal_5fe3c0539d12f.pdfIn PDF document text
    • http://businesslinecenter.com/gegovalotusutasodakijughuu8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487381/normal_60570dd29acc5.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/310403230288o2bi.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/longest_research_paper_ever_written.pdfIn PDF document text
    • http://jevafurevozu.mygamesonline.org/mahalaxmi_calendar_2020_october.pdfIn PDF document text
    • http://silvanozito.online/cm8870_dtmf_decoder_circuit_diagram_datasheetk7lj6.pdfIn PDF document text
    • http://prostotit.site/gotijazokoxabusugivixl6os8.pdfIn PDF document text
    • http://esagafow.fun/first_alert_carbon_monoxide_alarm_keeps_beeping3bj5p.pdfIn PDF document text
    • http://duxinivodozular.mywebcommunity.org/binomische_formeln_rckwrts_bungen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421218/normal_6010fe12b465f.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://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_off0000e60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60E 4816 bytes
SHA-256: da24d3fd2d9c9879d8307745cbe37e365f262cb0661657fedabc831ea7b02378
font_01_sfnt_off0000f686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF686 11632 bytes
SHA-256: 08dd043cf91d5dd98f08f6c70df313adb6a406a02d1cfe35a2f1f1c3cb16d33a
font_02_sfnt_off00011d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D71 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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