Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa081964c28d0a0d…

MALICIOUS

PDF

94.3 KB Created: 2021-05-22 10:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 379db3026fe5b61ba9ef361bfdd4bf0f SHA-1: 23a31ddb2d1c9f7e678fe5e469bd4c2d707182b1 SHA-256: aa081964c28d0a0d7ac3623fdc668dd46a2484292ad7a8a865db9429d5ccea47
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://vilenefex.ru/strik?utm_term=gynecoid+pelvis+important', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://vilenefex.ru/strik?utm_term=gynecoid+pelvis+important PDF link annotation
    • https://jikajulimag.weebly.com/uploads/1/3/4/3/134319013/pavukowez-wewos.pdfIn PDF document text
    • https://lonamoki.weebly.com/uploads/1/3/5/9/135964194/6052764.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/028bd001-6a77-48d6-a8bc-75b6fbce74e8/vevixawinuxifotumonuxak.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/golejon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d846e70-b441-45a1-9f08-0261f9b2603d/mnps_payroll_calendar_2020-21.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/price_of_new_aston_martin_dbx.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/minecraft_apk_mediafre_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a884973b-c7c2-4e78-abe1-9b1713417334/vadogudatubuzidaxufefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01a59ef8-e245-4e72-879a-89140f5267f8/lasko_tower_fan_ionizer_review.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/49933297162.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/sea_of_thieves_accordion_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/kilapukedisubijem.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/is_peeta_dead_in_catching_fire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c416fe14-42d0-450a-acf8-63d2a700fda7/kimuk.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/cwm_recovery_zip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83fc84ee-ffb0-4736-ae5b-e98136018a74/56233032458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88c9e22c-2f18-49c4-9d17-a696176559cd/rusa_dilbilgisi_susanna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0e03a97-70c1-4ecc-af6c-ef97d9db1a3a/96361398065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2245dbe-7ec7-4507-a330-936703588500/gumeremebavowowofan.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/best_android_root_apk_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0787a22e-4aed-4258-a688-45aacff82d43/harley-davidson_service_prices_near_me.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_off000132f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F2 5412 bytes
SHA-256: bbb5ceb3e3df6ccf0ee6cddb7ce517af6c6929b7ba4ffe383dd382a6ccf4d725
font_01_sfnt_off00014555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14555 10892 bytes
SHA-256: c1d80e036335e3f34ef8f4ce592cad4d3ce2711a15f6631d7789afbc92f94fcb

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