Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a91ea6202ed4d0…

MALICIOUS

PDF

83.8 KB Created: 2021-05-03 21:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e33c1ca2be7f9348931a6cdc51d6ad03 SHA-1: e897f00e5952e8309a9402cf51887e479175eb8e SHA-256: d0a91ea6202ed4d0defa234ab33cb088c9bd562f9611261968eee545ee6db7ed
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=menu+for+el+pollo+loco+restaurant PDF link annotation
    • https://cdn.sqhk.co/bumegukomuza/YWJhfid/d-_day_beaches_self_drive_tour.pdfIn PDF document text
    • https://cdn.sqhk.co/vefemenivu/gdzb6CH/xelefegudagofegewixupos.pdfIn PDF document text
    • https://cdn.sqhk.co/dutedape/wrBhabF/led_balls_for_bike.pdfIn PDF document text
    • https://cdn.sqhk.co/loxepafigav/hibWihq/measure_of_supplementary_angles_calculator.pdfIn PDF document text
    • https://cdn.sqhk.co/teduwugevoki/z0igegN/carillion_kpmg_report.pdfIn PDF document text
    • http://qwonder.space/what_are_the_three_waves_of_feminismrcpir.pdfIn PDF document text
    • https://cdn.sqhk.co/lipebefaje/gehiabK/66994594540.pdfIn PDF document text
    • https://cdn.sqhk.co/dijawagag/acgck6m/4970365512.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/bNiaghU/wawikazalurar.pdfIn PDF document text
    • http://websecurer.tech/oracle_database_sql_certified_associate_1z0-071fql65.pdfIn PDF document text
    • http://stroy-level.ru/17519963444r771o.pdfIn PDF document text
    • https://cdn.sqhk.co/bimonabozo/jahhige/vertical_packaged_air_conditioning_units.pdfIn PDF document text
    • https://cdn.sqhk.co/tefupudoma/fXD6EJw/pictoword_level_60-_100_answer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://40052bae-d6b0-4be3-9c84-96956a804c69.filesusr.com/ugd/32907c_133c293cfe1f4be191533165a2cdbf71.pdf?index=trueIn PDF document text
    • https://b3695a61-a5b7-457a-863f-99677d03e0cc.filesusr.com/ugd/f2a82d_3fb9f150085d4aa883556eb90c5bc787.pdf?index=trueIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_48a4b0b0fa2d48bb91d0d1ecec51d0eb.pdf?index=trueIn PDF document text
    • https://99d0733d-4d0e-4d19-b238-fea6f81017ca.filesusr.com/ugd/e32e4a_1ef9804c174d418999a767e19dabded1.pdf?index=trueIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_1a9baf7ad7424dbcaa67122735d86e2e.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_0b7accc775844c5eaa0d476456c15275.pdf?index=trueIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_5e2fee2b8ad2486085c46a71564a8f18.pdf?index=trueIn 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_off000107f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F4 5012 bytes
SHA-256: 14f1c85aadbcaf59188105c36596b1c6a6205a7556e01af09ed5d6d9174dbf5f
font_01_sfnt_off0001191e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191E 12028 bytes
SHA-256: 4fcf4c762aeef727252010b819634a278e987335e624d14d84e26739a723f922