Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a966c52acc58db…

MALICIOUS

PDF

74.1 KB Created: 2021-02-23 21:55:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0204d2508d65b27ce0eee139d26f3ae3 SHA-1: f76d275ed0ada4fcddcbbc6a4a4a6fc551ff2b3a SHA-256: 67a966c52acc58db0abf896572da643db10aa8702bead783fa65196a338f306d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded URLs point to various domains, some of which appear to be disposable hosting, reinforcing the malicious nature of the document.

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.
  • 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://jacksth.ru/wix?keyword=star+wars+model+kits+hobby+lobby PDF link annotation
    • https://cdn.sqhk.co/poxirowo/6Ojc3ih/33962326691.pdfIn PDF document text
    • https://cdn.sqhk.co/punipopi/FlLichi/tennessee_titans_schedule_tickets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447089/normal_601fd9b655293.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/gRBPVhf/71062483603.pdfIn PDF document text
    • http://suzenax.22web.org/incomings_and_outgoings_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407327/normal_5ffe2f8687db4.pdfIn PDF document text
    • https://bojowavezuzabi.weebly.com/uploads/1/3/1/3/131382797/gagakibudomawox-siluzunopeke.pdfIn PDF document text
    • https://cdn.sqhk.co/pobopuwubox/foHicD5/avatar_creator_full_body_free.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/xomad_kexag_viwale.pdfIn PDF document text
    • http://gafegenuwegapok.iblogger.org/which_is_best_oil_filled_radiator_or_convector.pdfIn PDF document text
    • https://supagerafigi.weebly.com/uploads/1/3/0/8/130874211/sabedotegal_ruwaparide_sebafezowoja_wosofidufof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426675/normal_5fed81a04817d.pdfIn PDF document text
    • https://sixalusizefew.weebly.com/uploads/1/3/1/3/131378898/524254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_601647ac93154.pdfIn PDF document text
    • http://palipupo.22web.org/gamesir_gk300_manual.pdfIn PDF document text
    • https://mebijanuwirat.weebly.com/uploads/1/3/4/0/134042853/8131766.pdfIn PDF document text
    • https://xijiruxexewige.weebly.com/uploads/1/3/4/7/134725886/tekezi.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/fbhewG2/57596382982.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziwilud.epizy.com/pejomojadapana.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_off0000e58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58A 5564 bytes
SHA-256: 1d506e18c56a0190b1942131c7af06cc723c528f8c2be38763c658b5027adc9d
font_01_sfnt_off0000f85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85C 10264 bytes
SHA-256: 09bbd47aefd2056c1677ae36f14b80c35ab95081d067d8fb884fffc5a6653d61