Malicious PDF — malware analysis report

Static analysis result for SHA-256 a371c4d63b6c5ee0…

MALICIOUS

PDF

79.8 KB Created: 2021-04-07 20:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ee81c2956276d0f9d688e25252eaa646 SHA-1: 69073000874ec712a1fac28e4c03cd93b322d8e7 SHA-256: a371c4d63b6c5ee0bec094df7f2c5e394244d2c297ad19aee918d2a27d87ba5c
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The embedded content, though heavily obfuscated, appears to be related to SEO and potentially malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xezojetit.ru/strik?utm_term=how+do+you+go+into+deep+sleep PDF link annotation
    • https://poroxokinawutaj.weebly.com/uploads/1/3/4/5/134507376/739071aa5f.pdfIn PDF document text
    • https://monubigikupo.weebly.com/uploads/1/3/4/4/134493781/64319.pdfIn PDF document text
    • http://jakartapro.xyz/46640522064rda4m.pdfIn PDF document text
    • https://noxijinijomud.weebly.com/uploads/1/3/4/7/134746703/3130f82414da0.pdfIn PDF document text
    • http://sikazigazes.mypressonline.com/busivaradafeludarilap.pdfIn PDF document text
    • http://xitnet.fun/gezojoredadakadumdf7xf.pdfIn PDF document text
    • http://pusapev.scienceontheweb.net/aashto_lrfd_bridge_design_specifications_7th_edition_espaol.pdfIn PDF document text
    • http://fofolep.mywebcommunity.org/koladutabirirenetefusufog.pdfIn PDF document text
    • http://gakawisogafuga.mygamesonline.org/kowometiwos.pdfIn PDF document text
    • https://papenuxid.weebly.com/uploads/1/3/0/8/130874395/bejovaf-wijuwikopod-devodaxuvoju-tevosi.pdfIn PDF document text
    • http://tixokapine.mypressonline.com/43161420101.pdfIn PDF document text
    • http://tesekal.mygamesonline.org/what_is_bounded_rationality.pdfIn PDF document text
    • http://price-list.moscow/texesokfcza.pdfIn PDF document text
    • https://mazaziwijofe.weebly.com/uploads/1/3/4/7/134757439/pumelusuduvulatat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0108a07e-94d6-443d-bfa7-575dd38852ad.filesusr.com/ugd/756a01_b0ad4e89d5e543538cdb8f602f212a7d.pdf?index=trueIn PDF document text
    • http://lumosaneja.onlinewebshop.net/45760104381.pdfIn PDF document text
    • http://nizulodezif.rf.gd/belarus_250as_service_manual.pdfIn PDF document text
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_625fd2dda71a44ca83c049a671492df3.pdf?index=trueIn PDF document text
    • http://kofaxafogi.myartsonline.com/tovoluto.pdfIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_ee418214349d4f1281fcdb28ce4a66f3.pdf?index=trueIn PDF document text
    • http://rubuvajaroxe.epizy.com/vizogutaxupudariku.pdfIn PDF document text
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_1c62183156b9448cba9ca9b23f4a251a.pdf?index=trueIn PDF document text
    • http://zikapoxev.epizy.com/speed_velocity_and_acceleration_worksheet_answer_key.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_off0000fab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB3 4976 bytes
SHA-256: bfc16ac58f8087b7a213968fc0f529ca59d92ed779873001d04aaec646e4de10
font_01_sfnt_off00010bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD3 10792 bytes
SHA-256: c7e85417b8bc427fb164c27cc65ad6878128cc81d4113d395f2151a7a23184a7

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