Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb912e611f447db…

MALICIOUS

PDF

79.5 KB Created: 2021-05-20 19:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c352b438b15b5edde5eb80bbacc64411 SHA-1: b915fedd471be0d48ed27087e58961db8978d3bb SHA-256: 8cb912e611f447db0b816e60f1e1c868e1d79a887500bd152f63959d4e8106fe
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt. The embedded URL points to a suspicious domain, likely intended to host malicious content or redirect the user to a phishing site.

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
  • 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://mezovuduw.ru/strik?utm_term=reading+stories+for+kindergarten+pdf PDF link annotation
    • https://najijufo.weebly.com/uploads/1/3/4/7/134714833/4579111.pdfIn PDF document text
    • https://xiluxobafuju.weebly.com/uploads/1/3/5/3/135323992/nuremakurenexunud.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/e2bd0767-c401-4e28-bbf2-d35750871938/jaburinirevowefebumujeni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d88e3882-24a3-4a35-a050-a097bf580e69/55673714577.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/z87_pro3_overclocking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46707e8d-aabf-401f-9a39-be91fcd76800/honeywell_quietset_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/176882c4-3635-45bb-b539-a94a44aea9cb/montessori_preschool_activities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e94c4b3-c50e-4cd9-af27-49125841c8fc/resumen_libro_la_mascara_de_la_muerte_roja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae382fd6-0526-49ed-94ed-4cc3e5f2dc2a/ge_profile_advantium_120_wont_heat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41cb587e-6685-441a-a633-c605acf5d252/hp_laserjet_1536dnf_mfp_inkt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b38a982-3582-4a11-a083-3876c0741242/how_to_find_slope_2_points.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/605ba450-2478-44de-bb07-fd2ccd1e7177/54333849902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4053c50-b29a-4023-98ad-1b60b0668664/bowflex_treadclimber_model_tc1000.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/wugikefarobirapufusigi.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/dog_dental_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/199cf651-db8b-4027-86a5-10b9f7a1117e/xunurebotipomusonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62d48245-ef68-4ad4-bbf4-48e49888faf2/nordictrack_exp1000_weight_limit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da766de9-22f1-4a15-b92c-d6d693204948/15948118978.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/social_ontology.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_off0000f9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 5248 bytes
SHA-256: cec43c265c6969f3d930ab41d10d21428d2f9e419eaf2a00dd1f86957d645854
font_01_sfnt_off00010bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB9 10284 bytes
SHA-256: 0dd4360294414de59b377ab1daba1c27a1451fb768bbe00b1ae09589efc140cf

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