Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6d0513bec5d671…

MALICIOUS

PDF

78.3 KB Created: 2021-04-04 11:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: efa3c7d2250857a286dbb512f1905fd3 SHA-1: 502ae2dc8be92ab44037de58d735d100ea4480af SHA-256: ca6d0513bec5d6717f6ea9fc86784cf79bdad7edf0c1f22b80ec16151a360a5c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://resalured.ru/123?utm_term=picture+description+worksheet+for+grade+3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365624/normal_60165d99bb817.pdfIn PDF document text
    • https://jerezuwiwufuken.weebly.com/uploads/1/3/4/3/134355676/nunolumelowewokebus.pdfIn PDF document text
    • https://zobirifojufegot.weebly.com/uploads/1/3/4/3/134374070/xanogugumi_rapane_bevimerobagul_boxijakaxifapum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5fd6392ba672c.pdfIn PDF document text
    • http://vixilebi.iblogger.org/atkins_induction_phase_foods.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/gja1han/penguin_coast_runner.pdfIn PDF document text
    • https://cdn.sqhk.co/mumesimasozo/dLbhe6B/crop_tops_without_strap.pdfIn PDF document text
    • http://wokulorumal.iblogger.org/daxagu.pdfIn PDF document text
    • https://cdn.sqhk.co/gubusase/tUIijig/ascend_performance_materials_annual_revenue.pdfIn PDF document text
    • https://cdn.sqhk.co/tedalome/7whagh1/solar_system_planets_worksheets_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392474/normal_603556bd8fc9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417306/normal_6011df2c2b1ff.pdfIn PDF document text
    • https://nofodomeki.weebly.com/uploads/1/3/1/8/131871852/xaforexike-dowikotatu-janelugowelupu-rubedinerelaf.pdfIn PDF document text
    • https://cdn.sqhk.co/sadudolamom/hVd87dK/adventure_communist_steam_cheat.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
    • https://s3.amazonaws.com/bogeguva/how_to_win_every_argument_book.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/how_do_bottom_load_water_coolers_work.pdfIn PDF document text
    • http://zaxexopufo.epizy.com/judubobusiripogedolemi.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/tubosemofulep.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/54935586332.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/60753860471.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/36621782635.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/89407722508.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/zalonemi.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_off0000e38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38B 5588 bytes
SHA-256: 631556c197d32f6fe915ba6bb95c534cb54e5f59fb31aad22989995f74fd56d9
font_01_sfnt_off0000f69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69A 10668 bytes
SHA-256: 9669bed6a51d328fc33ff85f396d3491d6d82e7d27a20543634730076c43da1f
font_02_sfnt_off00011b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B29 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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