Malicious PDF — malware analysis report

Static analysis result for SHA-256 501d4bb4bdeb30bb…

MALICIOUS

PDF

85.5 KB Created: 2021-05-21 09:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9d944e508c82a1e2330eb4d773be2339 SHA-1: d8e56cf22711b6487090d46da892a912d470936a SHA-256: 501d4bb4bdeb30bba727eed2c67a033ff10a7e6118580923a82a86af8c93e555
204 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a lure for downloading a compressed archive, indicated by the document body and the 'Password-protected archive handoff' heuristic. It also features a large number of external links, many pointing to S3 buckets, suggesting a link farm or distribution mechanism. The primary malicious URL identified is seumenha.ru, which is likely used to host or redirect to the actual payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://seumenha.ru/strik?utm_term=download+gta+5+setup+highly+compressed+rar+for+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383137/normal_606409c136dd0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459796/normal_5fc88f43d9e26.pdfIn PDF document text
    • https://tibijipobarak.weebly.com/uploads/1/3/4/4/134493900/gazakiwodexesap.pdfIn PDF document text
    • https://juxipidupe.weebly.com/uploads/1/3/4/6/134694928/39999b872873e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463824/normal_601992af004f0.pdfIn PDF document text
    • https://xikobidena.weebly.com/uploads/1/3/6/0/136097244/vavumadi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/fajuwevapetaterorof.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/bioscope_live_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/distribucion_normal_estandar_z.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/amazing_grace_two_part_harmony_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/ascomycetes_characteristics.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/rudolupelabijudasab.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/riddles_in_english_with_answers_for_adults.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/bunebinoma.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/safety_1st_alpha_omega_3-in-1_car_seat.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/rosen_discrete_mathematics_7th_edition_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/14964781646.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/nifupudojulojape.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/wanalorotexupafu.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/android_tv_box_max_pro.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_off00010c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1F 5888 bytes
SHA-256: 1095c2662b0d44327f22cacdc66dfe538bdb36ae91e30bef0f198518160afcfc
font_01_sfnt_off00012024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12024 11640 bytes
SHA-256: 5a3c95b35e10d38f98c5a87768732206b519fa6beb052723cdf1230705a99951

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