Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a6270f188fb26d…

MALICIOUS

PDF

66.8 KB Created: 2021-02-24 01:31:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 7b771ebfa6d8881647990ed1c181de14 SHA-1: e71ec9648b9013e75fd265d8efba2623b96c58f7 SHA-256: 81a6270f188fb26dce1641d480af4c15c0307eac0ed8fca3fca7b36e3c9ae07a
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links that redirect to external websites, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains references to wkhtmltopdf and Qt, suggesting it was generated programmatically to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+scan+multiple+pages+on+canon+pixma+ts8220 In PDF document text
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/1337309.pdfIn PDF document text
    • http://rojemop.iblogger.org/xonafilixunoxuv.pdfIn PDF document text
    • http://silikidabog.22web.org/74187941135.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/t0jcWuf/85414568107.pdfIn PDF document text
    • http://wofirulufe.iblogger.org/4249962832.pdfIn PDF document text
    • http://xupogete.iblogger.org/monthly_expenses_tracking_budget_template.pdfIn PDF document text
    • http://doweryklkq.space/hp_designjet_5000ps_large_format_printers69af.pdfIn PDF document text
    • https://cdn.sqhk.co/dovepomazeri/fghBidQ/planet_om_nom_nom_game.pdfIn PDF document text
    • https://cdn.sqhk.co/papebikuwi/f9WggFv/star_wars_characters_costumes_diy.pdfIn PDF document text
    • http://fifuxuzod.iblogger.org/t_shirt_design_website_template.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://kogopixipinal.epizy.com/misobimoworaxesetigutunis.pdfIn PDF document text
    • http://vesebebiwimana.epizy.com/olympic_fanfare_and_theme_sheet_music_free.pdfIn PDF document text
    • http://bezopiwuzalobit.rf.gd/buliw.pdfIn PDF document text
    • http://musowafotoxipid.epizy.com/what_are_the_different_types_of_pex_pipe.pdfIn PDF document text
    • http://jagogapibibolin.epizy.com/26617819776.pdfIn PDF document text
    • http://fizetoxeloxiti.rf.gd/18667819904.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_off0000ba60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA60 5628 bytes
SHA-256: 8b960c00839f151ded100ad9bec058ae8e17c136f83212e0b8dd8d670ad78a38
font_01_sfnt_off0000cd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD86 10112 bytes
SHA-256: 9e9dd3e3b7e132fdc3254c664741ffabf2d31882b31e9e59f2eb38effd8518c0
font_02_sfnt_off0000f019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF019 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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