Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3b385cf9481db5…

MALICIOUS

PDF

71.9 KB Created: 2021-02-15 10:11:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 5bff7f8cb2371c6dc11a2a9116ee63ff SHA-1: fa17bb02b068b22a86cd8dee16885b0ca78c9834 SHA-256: bf3b385cf9481db51f5c31b85e17cbc88d7f9a7f897a5c6ca899bdd07e4a74fc
104 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. The presence of an external URI pointing to a suspicious domain, coupled with a heuristic for a visual download button, suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious workflow designed to trick the user into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://leonvi.ru/aws?utm_term=bharathiar+university+mba+books++pdf PDF link annotation
    • http://kilagine.22web.org/xorexejatitobafudufigev.pdfIn PDF document text
    • http://creamwalls.space/wheel_size_sigma_bike_computerm27nw.pdfIn PDF document text
    • http://kozijadeji.22web.org/rewuwerenixob.pdfIn PDF document text
    • http://0fruit.space/totally_free_spy_app_for_android_undetectablexuxsn.pdfIn PDF document text
    • http://zoneeuro.pro/optex_ivisiond4mv3.pdfIn PDF document text
    • http://fabulouss.space/office_visio_2010_64_bit_downloadc9pau.pdfIn PDF document text
    • http://ru-1.casa/zibekedetativesafedonyd0du.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/midizaxopazeji/annelids_hack_android.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/remove_recent_bookmarks_chrome_android.pdfIn PDF document text
    • http://nanaxaj.rf.gd/kezazowodumonefodajinexuj.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/54894374990.pdfIn PDF document text
    • http://vejesigivilowen.rf.gd/43083926870.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/answering_service_care_interview.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/pivuviga.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/accuracy_and_precision_worksheet_tes.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/80360945429.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/cyclone_installer_v1._22.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/kilofuralikivilelasew.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_off0000d281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD281 5664 bytes
SHA-256: 34be39ccdc94ff3dff55fc43402525b2ff8abcc93582b0d1a7f4b7210f211912
font_01_sfnt_off0000e5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A7 13744 bytes
SHA-256: 7a2f7e37aa5b95858bff5ca328525239991848cfa50f25aaa3aac423bfc3bd8d

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