Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2196c1bd61c12d…

MALICIOUS

PDF

80.2 KB Created: 2021-04-11 08:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 71faae4618fa8507024d43c4a0b0dbbf SHA-1: 1085c54546027117421e8ef6afb2cbb9c310f83b SHA-256: aa2196c1bd61c12d224a30646ba225b25e1e31846b2966e85fc5e9ba5714bd36
134 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://xezojetit.ru/strik?utm_term=excel+vba+range+to+array+one+dimension PDF link annotation
    • https://cdn.sqhk.co/feluxolid/zgexdjS/difemuripevaj.pdfIn PDF document text
    • http://kulufoxeru.22web.org/99715308013.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/jbjduhf/93208827745.pdfIn PDF document text
    • http://puwobero.22web.org/kabojug.pdfIn PDF document text
    • http://gifazat.iblogger.org/64755803636.pdfIn PDF document text
    • http://teraxekubute.iblogger.org/9679440048.pdfIn PDF document text
    • http://vuvowepo.22web.org/52345486620.pdfIn PDF document text
    • http://zadodol.22web.org/html_editor_for_android_mobile.pdfIn PDF document text
    • http://roxopazin.iblogger.org/que_es_el_ligamento_falciforme.pdfIn PDF document text
    • http://nubinugegeb.22web.org/bartholinite_aigue.pdfIn PDF document text
    • http://vejofewi.iblogger.org/proportional_relationship_questions_and_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lejarojat.rf.gd/motorola_bluetooth_headset_pairing_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d1bde45-c012-42c0-b545-867aa8f33825/vujalenisusarenarigux.pdfIn PDF document text
    • http://magovinirubow.epizy.com/3064518213.pdfIn PDF document text
    • http://xofemamerisip.epizy.com/for_cause_and_comrades.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e4fa8ef-b9fb-4520-a935-e89bd5731576/98206182249.pdfIn PDF document text
    • http://lifugebavu.rf.gd/how_to_enter_network_marketing.pdfIn PDF document text
    • http://fefugadabojenip.epizy.com/71135657778.pdfIn PDF document text
    • http://vegizutix.rf.gd/digital_marketing_executive_jobs_in_noida_for_freshers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e87bf290-93a4-4273-a688-e6bbebe19b33/wufowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bca9884-073c-4e99-a255-9be097f4a50b/how_much_can_a_ford_ranger_tow.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_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 5588 bytes
SHA-256: 339a46ecbac36903306afe8c7d9c3648d462a70d0c3b421ca45dbcfb97c51402
font_01_sfnt_off00010bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF2 11092 bytes
SHA-256: c120e59ee48e60dcac0930bac5fc573b07897e92a6f64f6fa07cb4490305c1fb

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