Malicious PDF — malware analysis report

Static analysis result for SHA-256 42cf5d4d1693b5b1…

MALICIOUS

PDF

128.0 KB Created: 2021-03-17 12:37:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6898819475f6950f74db6ca72a4ddcc SHA-1: 4b4257085d27d6a835f602f6d9de2453a44b6801 SHA-256: 42cf5d4d1693b5b122954ad77300391f22d26bce1cf329ed909cbc47d664daf0
196 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, disguised as search results for a technical manual. The 'PDF_SEO_LINK_FARM' heuristic indicates that this is a deliberate attempt to create a link farm, likely to distribute malicious content or for SEO manipulation. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests that the document may also be intended to trick users into providing passwords for encrypted archives, a common tactic for evading security scans. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://maypoin.ru/wix?keyword=fundamentals+of+vibrations+meirovitch+solution+manual
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/6991067.pdf
    • http://carbags.site/forest_wallpaper_full_hd_download_for_pc7p6d4.pdf
    • https://ziwivebagojub.weebly.com/uploads/1/3/1/8/131871618/3954731.pdf
    • http://rutetasilatigo.iblogger.org/24309035410.pdf
    • https://nupimixek.weebly.com/uploads/1/3/2/7/132712066/6891499.pdf
    • http://samo-katim.ru/768100987785nptb.pdf
    • https://xewulatejema.weebly.com/uploads/1/3/5/3/135345986/givaxevu.pdf
    • http://winsbig.space/17563884120711vk.pdf
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/xodunudefugevugaxixe.pdf
    • https://bugedosase.weebly.com/uploads/1/3/2/7/132712019/suwatig-dotam.pdf
    • http://todayshop.website/765802482kfl0a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tutazena.epizy.com/cardizem_drip_davis.pdf
    • http://vesofimuni.rf.gd/34563343940.pdf
    • http://wubipuvupiwar.epizy.com/zatidakikofosome.pdf
    • http://kilirafesiva.epizy.com/fugeninixogodapajaxitaguk.pdf
    • http://mevelidefa.rf.gd/grails_unit_test_controller_render_template.pdf
    • https://uploads.strikinglycdn.com/files/8f3ead9c-119d-490a-964d-f551bd66c22b/zawuripu.pdf
    • https://uploads.strikinglycdn.com/files/b44bc2f1-07f7-443b-976a-cd299d0d6c38/printable_rgb_color_chart_for_sublimation.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001d378.bin
fb3cae7e4547ccb72e46186d8fc69da920f44dcbd12a5ea52a2228ffd67a6e3f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1D378 18704 bytes
font_00_sfnt_off00018ce4.bin
b3177c8de935bf2e05ba58035bb430970af2c83108b60a2dfb12b0772094c699		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18CE4 2912 bytes
font_01_sfnt_off0001973f.bin
d79f3b55789a92eb00a106f5f06ea12c96f7a55e65f89ae67d0e2e3668296d27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1973F 5416 bytes
font_02_sfnt_off0001a989.bin
693887f0371c8d170b45ae0a5c2b6693f5234a75ee1a11658878eb7493138ba2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A989 12448 bytes

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