Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa521a913cac0e4c…

MALICIOUS

PDF

70.3 KB Created: 2021-06-07 10:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 56fe718e49f2fd28f2a518461ffcbea3 SHA-1: def279cf71f3f36338c79eb1287fc83315becf77 SHA-256: aa521a913cac0e4cd1fb4debfc45e64808b7607bfee828599c6b2931525d2f02
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/pbw?utm_term=how+to+test+megger+calibration PDF link annotation
    • https://notokawuwo.weebly.com/uploads/1/3/4/8/134856920/2f4acdb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426686/normal_604b57de576b7.pdfIn PDF document text
    • https://duxuremi.weebly.com/uploads/1/3/4/6/134623812/kejogawitasuro-lubesawis-tisemira.pdfIn PDF document text
    • https://batusuxejodasav.weebly.com/uploads/1/3/1/8/131857782/1471672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385859/normal_6031939f904bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jabodawo.pbworks.com/f/31868175068.pdfIn PDF document text
    • http://moxulolo.pbworks.com/w/file/fetch/144475329/what_are_some_general_objectives_of_appraisals.pdfIn PDF document text
    • http://nukuxim.pbworks.com/w/file/fetch/144701463/95054195791.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/91023225177.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/f/how_to_get_slope_of_a_perpendicular_line.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/f/mini_militia_unlimited_bomb_ammo_nitro_game_download_apkpure.pdfIn PDF document text
    • http://kelivesas.pbworks.com/f/77586354397.pdfIn PDF document text
    • http://wuranosa.pbworks.com/f/mivugejipapudodoxuvo.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/52294456850.pdfIn PDF document text
    • http://pagorevet.pbworks.com/f/canon_eos_rebel_xs_analoga_manual.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/w/file/fetch/144416148/cash_flow_diagram_template_excel.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/w/file/fetch/144466725/90200081416.pdfIn PDF document text
    • http://biduzoku.pbworks.com/f/walebulizavosuvud.pdfIn PDF document text
    • http://ravowibosu.pbworks.com/w/file/fetch/144613152/fashion_icon_mod_apk_free_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD546 5312 bytes
SHA-256: 3cdefeb2724d753ef1e54679ab7d0a6e2279d400058e055e5a38d3524621cd33
font_01_sfnt_off0000e752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE752 10752 bytes
SHA-256: 5ed4238687740100793986020156cfc869ffdec4cf4d9483999621da258603a0

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