Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca03eb75e64ef56b…

MALICIOUS

PDF

76.8 KB Created: 2021-03-18 18:12:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4537a3668bd4d2433a8cda5714449814 SHA-1: b40b930d757e1550811bf65d8f60d608b8da989f SHA-256: ca03eb75e64ef56bc7923db3d190773225cb641ec005a73a0bc6d05e73f9e2ab
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

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/wix?keyword=fortnite+mod+apk+free+shopping PDF link annotation
    • https://bufasijo.weebly.com/uploads/1/3/2/7/132740378/7079362.pdfIn PDF document text
    • https://xegadoponuxi.weebly.com/uploads/1/3/0/7/130775279/zomovo_tidupotiwara_nivirutoduvuza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443815/normal_5fe14ec1eecd4.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/Csibajg/toca_builders_apk_obb.pdfIn PDF document text
    • https://cdn.sqhk.co/dukasavubu/giT4YyM/city_smasher_mod_apk_1._7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482860/normal_5fcd720d73263.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/iMDWngd/round_corner_pro.pdfIn PDF document text
    • https://vozokeku.weebly.com/uploads/1/3/1/8/131857213/6252679.pdfIn PDF document text
    • https://cdn.sqhk.co/remozemot/Egj4ggt/semozilikexenalavorero.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/Joieibp/vyapar_gst_invoicing_billing_accounting_inventory.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/eQ7nFex/nintendo_switch_carnival_games_best_price.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501208/normal_5fc9528cd774e.pdfIn PDF document text
    • https://cdn.sqhk.co/zuwiwejagub/eicgehg/.pdfIn PDF document text
    • https://cdn.sqhk.co/tozegatopaxu/dgijahd/80988698098.pdfIn PDF document text
    • https://cdn.sqhk.co/gogerazina/P67VjhO/hyperscape_ps4_settings.pdfIn PDF document text
    • https://zigakenipipoto.weebly.com/uploads/1/3/4/1/134131781/5574e0607.pdfIn PDF document text
    • https://cdn.sqhk.co/mitukutowum/icia6jj/chain_of_command_full_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/wifilivemij/ey6heid/gowojizikuvimemiz.pdfIn PDF document text
    • https://dofusugizubev.weebly.com/uploads/1/3/4/1/134108946/4533598.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/ifgfjbK/wingstop_promo_code_doordash.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/lgihjba/the_lawless_one_will_be_revealed_bible_verse.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/bbfbd009-a0b5-412e-9aaf-4f4ede9a82eb/42332687724.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab5a4155-01a7-464d-865e-e7927a740054/tazopufimewisezojuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4424880-8f35-4258-8376-4609abc1a6ec/vinususuwalufagamirafo.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_off0000ebfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 5444 bytes
SHA-256: b79ee7b57ea04feb585074ccbd4278ba6f26275d5362dc2f365fd20fbf1cf485
font_01_sfnt_off0000fe59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE59 12200 bytes
SHA-256: ae88a17fb39d175e7fba82e4532fa13cf31e61fca5cc7ad4696904cf15eb8404