Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8489d1f52d0ea1…

MALICIOUS

PDF

75.9 KB Created: 2021-03-27 19:27:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bfd2fa1323b0716b454d80c33216e92e SHA-1: 5ef664d910f7faed26d93eeeb868c230150b25e0 SHA-256: ef8489d1f52d0ea19dfb0d1536d485ec56ae26d7ff36f7a5e59cab77c2ee71d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • 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://nipisod.ru/wix?keyword=sample+thank+you+letter+to+doctor PDF link annotation
    • http://itwomen.space/mettler_toledo_conductivity_meter_five_easy_manualgu6rh.pdfIn PDF document text
    • http://opensalle.xyz/2019_tesla_model_3_standard_range_pricex27b9.pdfIn PDF document text
    • http://legrand-spb.ru/81321487578u32cs.pdfIn PDF document text
    • https://natumelazorog.weebly.com/uploads/1/3/4/7/134711419/d3606.pdfIn PDF document text
    • http://7lessons.site/mufokotibigakouv2i0.pdfIn PDF document text
    • http://rejasepilibuxep.iblogger.org/zolozomobidifefutip.pdfIn PDF document text
    • http://aycotoro7.xyz/sinaziqpg0.pdfIn PDF document text
    • https://lipojiwogim.weebly.com/uploads/1/3/0/7/130776075/dc1a31dadfa48f0.pdfIn PDF document text
    • http://riniwodifole.medianewsonline.com/riesgo_tecnologico_financiero.pdfIn PDF document text
    • https://bojifigo.weebly.com/uploads/1/3/4/8/134847606/04e5a250.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/aa_5th_tradition_checklist1jv3c.pdfIn PDF document text
    • http://potenciy.xyz/8382707543431qw8.pdfIn PDF document text
    • https://bamegipizof.weebly.com/uploads/1/3/4/6/134647446/pusiwapi.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/purawuma/guideone_insurance_jobs.pdfIn PDF document text
    • http://kenunapovogeto.epizy.com/canon_lbp6200_driver_is_unavailable.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/a_view_from_the_bridge_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/bujibobazedejuzulajizozos.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/lovebanegunerufa.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_off0000ea74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA74 5404 bytes
SHA-256: e480fa7434aa12e9eda8a6ddab359e441af771ad5894e57e8b6ab9e48017c802
font_01_sfnt_off0000fcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 10600 bytes
SHA-256: 0da1f51f8c040d2417d79ef411a32870de60b5d4776e1f2191a88365aad792bc

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