Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b20e0c788e432b…

MALICIOUS

PDF

80.0 KB Created: 2021-02-22 07:09:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0cad8868ad6b9aeb8e75e86cc6cf07c2 SHA-1: ec6082b1975ef49c3a809ad99d1b198f56e13b3c SHA-256: a5b20e0c788e432b4eaed041dfd19dbd00cae50e78186b88357f70bfac429a54
196 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, including one to 'baarspo.ru', suggesting a link farm or phishing lure. The heuristic 'SE_LOLBIN_RUN_COMMAND' firing with references to 'powershell_5.1.pdf' and various S3 bucket URLs indicates attempts to disguise malicious content or download further payloads. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a downloader or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://baarspo.ru/123?utm_term=how+to+use+incentive+spirometer+pdf PDF link annotation
    • http://andyhong.blog/xawetazupumulelugo1vlnu.pdfIn PDF document text
    • http://uniques.space/fuvulonatarinazelimujae2zdq.pdfIn PDF document text
    • https://komamizidunip.weebly.com/uploads/1/3/1/4/131437982/senelum.pdfIn macro / runtime command snippet
    • http://medtechnika1.ru/one_touch_drawing_apk_free_download0ng9e.pdfIn PDF document text
    • http://myyshooop227.site/quotes_from_the_adoration_of_jenna_foxs7t5q.pdfIn PDF document text
    • https://cdn.sqhk.co/lutadamafe/bzhciih/viral_videos_2018_facebook.pdfIn PDF document text
    • https://cdn.sqhk.co/migukosodaza/Lbib3gi/flight_simulator_2020_vr_support.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/jozetej/mexoboparapunovorutik.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/dungeoneering_training_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/action_provider_class_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/windows_server_2012_upgrade_powershell_5.1.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/guidelines_multiple_myeloma_melphalan.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/financial_report_2019.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/dazemi/jeteravifawibupum.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/besigow.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/how_to_reset_casio_pcr-t500.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/answer_key_for_12_quarterly_exam_2019.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
    • https://s3.amazonaws.com/lodazojamuva/guiIn macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCA 5172 bytes
SHA-256: b2d85a01c7daedc96a5697d2330a453ab9039e6525e40849fe440aaa53f7aaad
font_01_sfnt_off00010d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D66 11020 bytes
SHA-256: 7352ad7e9dcb7c9741f398fd99351448f665a174e3313bdda7e380f5f8f9d3eb

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