Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc4760eb4218a89…

MALICIOUS

PDF

75.5 KB Created: 2021-04-05 16:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a677f473c4cf59ff82580a063fb89ff0 SHA-1: 11b869b57f13d98703d8bcc6588d90161ab43ca4 SHA-256: 8cc4760eb4218a890e487e2a401f10fa7c54354c2acaf52899abb360bc6b7e01
134 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs, with one prominent URL pointing to a potential download for 'gb instagram apk mod'. The presence of multiple disposable hosting links and UTM parameters suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/123?utm_term=gb+instagram+apk+mod PDF link annotation
    • https://xewidepomizexas.weebly.com/uploads/1/3/0/7/130775014/gapariti-mubojixemi.pdfIn PDF document text
    • http://lulilafemavivog.mygamesonline.org/vokufe.pdfIn PDF document text
    • http://mantenancie.com/8650370299h09ci.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/mokezamurepefowegalunegu.pdfIn PDF document text
    • http://digitaloffice24.ru/responsive_answering_service_job_descriptione44ir.pdfIn PDF document text
    • http://xirijapip.mypressonline.com/glencoe_advanced_mathematical_concepts_precalculus_with_applications_teacher_s_edition.pdfIn PDF document text
    • https://pimazapodozem.weebly.com/uploads/1/3/2/8/132814260/pezidalugisiw.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/71875453559.pdfIn PDF document text
    • http://subbellassecret.com/56149507587fzs38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450723/normal_5fcb3e63426ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452169/normal_601446a9ba2aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386076/normal_5fd6047e2aa3b.pdfIn PDF document text
    • http://tamasolesodaj.mypressonline.com/2050323572.pdfIn PDF document text
    • http://jerabigemoz.sportsontheweb.net/75935613998.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391925/normal_5fc7d3a63add1.pdfIn PDF document text
    • http://bobujopolodusol.mygamesonline.org/practical_hemostasis_and_thrombosis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rogomore.myartsonline.com/53909583822.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/how_to_overcome_social_anxiety_public_speaking.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/13380719539.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/15278219751.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/french_language_learning_guide.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_off0000e886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 5480 bytes
SHA-256: cf00d6eaff7a89c07a51f0d9a51c46e3248aab2e1fb9a663096f82a78b64fc10
font_01_sfnt_off0000fb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB16 10448 bytes
SHA-256: d9e02acee7089f8478eaf6a03ddd83d665e8583782ecfb2d6b925eb8b25252ef