Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ffcee9fb5c0e33f…

MALICIOUS

PDF

83.1 KB Created: 2021-04-19 18:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b2404bb1c300a91fc3606088bd9fac43 SHA-1: 43e375b898239b44becb6442f6059c60c26badb3 SHA-256: 3ffcee9fb5c0e33f93dd46ab174c7455d1d600187001cb1b9beec24506b08ec8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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.
  • 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://xajibur.ru/strik?utm_term=beauty+and+the+beast+lost+in+a+book+review PDF link annotation
    • https://cdn.sqhk.co/wuzosiboweja/KZ6ggjj/motorcycle_helmets_shops_near_me.pdfIn PDF document text
    • https://baxakazakibabim.weebly.com/uploads/1/3/4/5/134585713/xileg_woweb.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/iGhbZih/1952509141.pdfIn PDF document text
    • https://rurasaza.weebly.com/uploads/1/3/4/8/134869927/niniwadotovezixiposu.pdfIn PDF document text
    • https://cdn.sqhk.co/puwukuwos/jaRCKwc/frontiere_republique_dominicaine_covid_19.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/p7V2hbb/nuzoromunatixelorubox.pdfIn PDF document text
    • https://rixafewokeget.weebly.com/uploads/1/3/0/7/130739987/zavobafuvuda.pdfIn PDF document text
    • https://bewokeramubi.weebly.com/uploads/1/3/1/6/131636949/1c00fba59.pdfIn PDF document text
    • https://cdn.sqhk.co/gisanewat/aigf8uS/90389527758.pdfIn PDF document text
    • https://wutusexiradolo.weebly.com/uploads/1/3/0/9/130969471/354078.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/jjgcjiX/bluestacks_hd_app_player.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/dkK3pgj/drumsticks_chicken_instant_pot.pdfIn PDF document text
    • https://cdn.sqhk.co/milevatomog/iaLQmjf/mtg_onslaught_tournament_pack.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/de7be566-1ca2-49dd-9fc4-6e879514db64/vafiwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b49b2393-46d3-4695-bd7e-ea6a48075695/moody_bible_commentary_romans.pdfIn PDF document text
    • http://jemekovivokuvup.epizy.com/89960891202.pdfIn PDF document text
    • http://lipepojofutuxuf.epizy.com/mowafefukabuniwugeb.pdfIn PDF document text
    • http://retinibefefemo.rf.gd/443281001.pdfIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_d56546691d36400a829af67c0a97a064.pdf?index=trueIn PDF document text
    • http://fujeximadotut.rf.gd/69838117781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7489df62-8ec2-45de-ad61-b0feff8bd613/33348753559.pdfIn PDF document text
    • https://793776f3-68b4-44d3-947a-596ce2c6f652.filesusr.com/ugd/4e977a_7f47bf7f6e664b2195d9a6c54ae76172.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e305f5ce-91ad-4846-99ea-6491c2459580/94175840013.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15F 5420 bytes
SHA-256: cb75e4d2a5c01513c2ad755d58a0727c13be213e132df4f8d295aa9fe05385d7
font_01_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 10680 bytes
SHA-256: 525a53041dda310c9aca42da2cdc667c543a37126a0b0bfd0a81f3aa9cf092bb
font_02_sfnt_off00012898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12898 16312 bytes
SHA-256: b2563e85233037e3c2780690ed1455257f868516b5a962e54e6ffe29314c9cb1