Malicious PDF — malware analysis report

Static analysis result for SHA-256 961830d33bb5aae4…

MALICIOUS

PDF

67.9 KB Created: 2021-02-28 18:00:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 741bf8078f240a7b7e40dba4134d186f SHA-1: 711d06f7c39d9fba059c47f7dd795454640042d3 SHA-256: 961830d33bb5aae47c4617834e35990a66428c4ed8ac5d083b1f938dc21f4a69
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating a redirector link to dafemum.ru. The ML classifier also flagged the PDF with high confidence. The document body, though heavily obfuscated, contains text related to 'btd5 battles hacked', suggesting a lure for users seeking game cheats or hacks. The embedded URLs are likely used to redirect users to phishing or malware distribution sites.

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://dafemum.ru/wix?keyword=btd5+battles+hacked In PDF document text
    • http://smartcreditus.info/didutotuphl8qk.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/interior_design_styles_explained.pdfIn PDF document text
    • http://vofidiporalives.22web.org/92697204661.pdfIn PDF document text
    • http://replyua.site/napoleon_hill_foundation_thought_for_the_dayssfmg.pdfIn PDF document text
    • http://timecodes.net/874695004693y19d.pdfIn PDF document text
    • http://barberking.best/74432352879mdzbx.pdfIn PDF document text
    • http://domainlimax.xyz/tesda_bookkeeping_nc_iii_exam_reviewerls6oy.pdfIn PDF document text
    • http://esclick.pro/what_are_the_cutover_activities_in_sap_pmzv9xv.pdfIn PDF document text
    • http://50offshop.pro/xibovetatehhffa.pdfIn PDF document text
    • http://bodyita.space/gravity_falls_theme_song_sheet_music_violinquwud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gegilifopom.myartsonline.com/fokuxebebujete.pdfIn PDF document text
    • http://kinikodiraxo.rf.gd/torenupufafevabobuzekur.pdfIn PDF document text
    • http://zuputes.atwebpages.com/81724454326.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_off0000cea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA7 5308 bytes
SHA-256: 79e5e09ff340e61fc041ff635d013b2e300dfc025a992c220c91ab5cb3ad6a80
font_01_sfnt_off0000e0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B3 9952 bytes
SHA-256: 8eea5a4de95b0e7c7e88e726e7fdaf82b12b41b6bbf22807328ab697f5ae7464