Malicious PDF — malware analysis report

Static analysis result for SHA-256 9594c76cabbf99ef…

MALICIOUS

PDF

76.6 KB Created: 2021-04-28 10:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 605f52a64396001fbd13a3dd3eb4a04b SHA-1: 22d792e3ac7ee645104c1787cd50670c54ea0b52 SHA-256: 9594c76cabbf99efcc98b1efb5fa8a39a088f601671216e2f524ff30346e88cd
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to SEO-optimized PDF hosting sites. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK indicate a mass linking strategy to redirect users to malicious sites like 'vilenefex.ru'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://vilenefex.ru/strik?utm_term=whose+reconstruction+plan+was+toughest+on+the+south PDF link annotation
    • https://zunimivivonuz.weebly.com/uploads/1/3/4/0/134017399/majunava_zadonu_redigave_mudut.pdfIn PDF document text
    • https://wixetaduzem.weebly.com/uploads/1/3/4/4/134471786/91dcb607a95fef.pdfIn PDF document text
    • http://winsl.space/what_makes_a_good_speaker_wire6z0f8.pdfIn PDF document text
    • http://rineset.xyz/comparing_apples_to_oranges_fallacyh8iyk.pdfIn PDF document text
    • https://cdn.sqhk.co/jijasitov/VibCLgd/girl_halloween_costume_ideas_2019.pdfIn PDF document text
    • http://nonretloli.site/mafaregojetivikemubamik9gmsy.pdfIn PDF document text
    • https://mogopefisumiba.weebly.com/uploads/1/3/5/2/135295831/0b8ab.pdfIn PDF document text
    • https://fetevosave.weebly.com/uploads/1/3/1/4/131438058/9703847.pdfIn PDF document text
    • https://cdn.sqhk.co/vogoxaginoje/fuEmhcF/scary_granny_doll_the_horror_game_2020_apk.pdfIn PDF document text
    • https://jibanexoruna.weebly.com/uploads/1/3/5/3/135338247/1372092.pdfIn PDF document text
    • https://cdn.sqhk.co/rowibimibopi/jfeheql/animal_crossing_new_leaf_guide.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/gezejoputiwinu/madagascar_4_full_movie_480p.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/wogewagelinupomo.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/array_map_vs_foreach_performance_javascript.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/26793571108.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/naposuzevejarupiz.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/90799098409.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/spark_browser_filehippo.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/batman_3d_live_wallpaper_apk.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_off0000edfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 5300 bytes
SHA-256: 0c9b7a504fd740a128eeee1c2bbf70da805f2ecf232f27f17ed2c18d30bf6ad0
font_01_sfnt_off0001001b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001B 10824 bytes
SHA-256: 5aa30cc227a1dd5461c91eb96a656bf68264452c5adf683868553a19c2deb3b9

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