Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb79843d234fd99…

MALICIOUS

PDF

74.4 KB Created: 2021-02-22 08:35:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bf08545bcfc76fc7a8988133bf3bfaff SHA-1: abf798dc74bacd79262ae322bb6c14962b2f53a7 SHA-256: 9eb79843d234fd999358f8708b822169c3dd5de8eedf033eca8488cc0949698a
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic firings indicate the document is designed as a link farm, likely to distribute malware or conduct phishing. Although no scripts were explicitly extracted, the nature of the embedded links and the ML classification strongly suggest malicious intent.

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 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.
  • 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/123?utm_term=how+to+read+bryant+furnace+model+numbers In PDF document text
    • https://lotojenamiz.weebly.com/uploads/1/3/1/3/131381761/9969550.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/jhdjbjd/the_girl_adventure_game_plant.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/Hv6PghK/vukirivafuguwu.pdfIn PDF document text
    • https://semanipiji.weebly.com/uploads/1/3/5/3/135312460/ligapelubufod.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/diegejb/joduruzuri.pdfIn PDF document text
    • https://cdn.sqhk.co/pewowutefiw/heibDib/xumirexojikuduvukatije.pdfIn PDF document text
    • https://cdn.sqhk.co/gubisagebuto/9zCu8tS/how_to_color_pretty_princess_belle.pdfIn PDF document text
    • http://zipujesilan.22web.org/berloni_catalogo_cucine.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/jcidafM/black_pink_piano_tiles_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jisokemefaz/u6GPRid/12596010571.pdfIn PDF document text
    • https://bamegipizof.weebly.com/uploads/1/3/4/6/134647446/joratiguxerez-dumomasavu-xixopijiwaza.pdfIn PDF document text
    • https://cdn.sqhk.co/fupokonabat/Riajbha/zebulipadano.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/70120345474.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/87098871858.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/mediheal_sheet_mask_korea.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/batman_wallpaper_1080p.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_off0000e1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FD 5460 bytes
SHA-256: bc48b30c8186e5d7ac17fe3a7b56dc446759568b4650dd196d98c78d09e705ad
font_01_sfnt_off0000f491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 11188 bytes
SHA-256: e35993b71b42d88a382ebc1e44af01a1d36f2e90290592040eb3a690c9cd342e

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