Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e420e2ab86731ea…

MALICIOUS

PDF

79.1 KB Created: 2021-04-15 12:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3b1ba53c02e91cec2e298a7ecef830b7 SHA-1: 47b57927771b418e5fbed8aec5f296aa5d61cda3 SHA-256: 4e420e2ab86731ea420756d7ca3567f3fd6161c2dc351ddf333297629e2854d6
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting, and one specifically uses a UTM term related to business accounting to lure victims. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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=how+to+maintain+books+of+accounts+for+small+business PDF link annotation
    • http://lagejarejitog.mypressonline.com/cryptocurrency_trading_books.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384160/normal_5ff3f77861b3d.pdfIn PDF document text
    • http://zavulibalox.mypressonline.com/36790372142.pdfIn PDF document text
    • http://lirebuwoke.mygamesonline.org/veredapiwifas.pdfIn PDF document text
    • https://cdn.sqhk.co/zejegure/jjheLEl/turikivitelijinifum.pdfIn PDF document text
    • http://zereteleriw.getenjoyment.net/33456057792.pdfIn PDF document text
    • https://cdn.sqhk.co/wupetutigo/FsqMdij/80195601946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486197/normal_60172694a6615.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/5XjdSjg/posidamavexilezusurudoke.pdfIn PDF document text
    • http://ramifapufebi.scienceontheweb.net/metro_cassina_de_pecchi_orari.pdfIn PDF document text
    • http://gadetebes.sportsontheweb.net/academic_adjustment_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496816/normal_60176a9d73288.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383132/normal_5fdc0b56bcc23.pdfIn PDF document text
    • http://suporefebakibur.mygamesonline.org/canon_m50_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417221/normal_603754f46caaf.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/canada_visa_form_5257.pdfIn PDF document text
    • http://lalikexitaxixix.getenjoyment.net/calentadores_solares.pdfIn PDF document text
    • http://rixadixiji.scienceontheweb.net/working_principle_of_astable_multivibrator.pdfIn PDF document text
    • http://relodifalixogo.scienceontheweb.net/macroeconomics_a_european_perspective_olivier_blanchard.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://napamewa.atwebpages.com/64213575245.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6249188d-e912-4ed3-97ca-5a488bb2064c/riruwajuxeteduki.pdfIn PDF document text
    • http://sadoboxijowem.myartsonline.com/wujogelezixujumapegu.pdfIn PDF document text
    • http://bowegasobufur.myartsonline.com/pemosokamabi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d00f11e3-19c2-4f7e-8ae5-c28e30d557cc/70238546906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fab1b93c-68f7-46e1-85ea-83527e14371c/guxipitojarobeketade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7735a11f-331c-4045-a72f-addb0fcea62f/jazakinokuvipefobosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68c7e102-3f7b-4d0f-ad9e-83417dd4ca1b/10110326373.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 5284 bytes
SHA-256: 53875d8a471040b85cd92d97e21f9e7b8bbbb70d348f8e00abe6188fd0ab99ed
font_01_sfnt_off00010a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 10792 bytes
SHA-256: 50c7ed007c621b59fae6a1041859c0a07ae4a1943ff1c4020a7262063c4862f6