Malicious PDF — malware analysis report

Static analysis result for SHA-256 036622df37984fa7…

MALICIOUS

PDF

95.7 KB Created: 2021-04-06 14:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3cdc40a215f5682e1604400ef638f3e8 SHA-1: 8759fad767af84c63e544d87bb61cc7766790777 SHA-256: 036622df37984fa72465998724ec2e598b7959eaf7e9c9bb15fa28b843e08747
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://gimoguvi.ru/award?keyword=ajax+request+data+type+pdf PDF link annotation
    • http://xidasetetobuge.scienceontheweb.net/circuit_switching_notes.pdfIn PDF document text
    • http://siradiru.22web.org/orchestration_book_free.pdfIn PDF document text
    • http://gejedesoni.getenjoyment.net/enalapril_davis.pdfIn PDF document text
    • http://vowufijetapiko.sportsontheweb.net/71942053525.pdfIn PDF document text
    • http://giwosesupalu.medianewsonline.com/bitwise_operators_in_java.pdfIn PDF document text
    • http://gudijogorirew.iblogger.org/wewipetazenarudowikemidox.pdfIn PDF document text
    • http://nulonelam.66ghz.com/basic_integral_calculus_tutorial.pdfIn PDF document text
    • http://zalofamanaw.22web.org/33590545199.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://49f3a523-2ddb-4f17-a073-729d67a362fa.filesusr.com/ugd/18c683_ad040c2cd52a43efac762397f6765b36.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6c0cac7-7ac0-4b51-86ce-4fa301e20229/38966765804.pdfIn PDF document text
    • http://rolewafofe.epizy.com/beale_street_restaurant_guide.pdfIn PDF document text
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_73c9452ed8634003b81f468968151607.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbdbbc2d-02e0-4c3c-b81d-70541b37c261/dash_diet_sample_menu_for_weight_loss.pdfIn PDF document text
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_d8c88e536d04472fa07c4da460543d96.pdf?index=trueIn PDF document text
    • http://kunibenurupamiv.rf.gd/57340911023.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e41ebfa-01cc-458a-8061-d45baad4affa/65130204987.pdfIn PDF document text
    • http://sukasorepej.rf.gd/lakawikukedimabosifit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7724f14a-2aab-42b5-8fba-4d7557dcf243/storytellers_guide_to_the_sabbat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68f366bb-8e17-43de-9a95-34bde5bb9958/nordictrack_pro_3000_treadmill.pdfIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_295179599db44e4681301ce1e406b18e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb904c38-3e3b-4636-a33d-a452934ac801/73186298912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd213cd4-abfb-41db-a1bb-1aaf1c5c02fe/76306386635.pdfIn PDF document text
    • http://wiwosotu.myartsonline.com/bcit_burnaby_campus_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c5883ee-f017-4b2f-bed6-28f89d4b436b/is_my_data_safe_with_the_nhs_covid-19_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db062110-f2c7-454a-ae53-0cff6f6c7d34/99544219327.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_off000135cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CC 5364 bytes
SHA-256: aceede16883dcc3dcc88d959fba4764d0ca62b076d1c45fef6db615c2d8a4122
font_01_sfnt_off00014828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14828 12080 bytes
SHA-256: 1b162457fb1f23b81196f537fd7354e3e325b6a81b35e73e0f43ad5ff77de257