Malicious PDF — malware analysis report

Static analysis result for SHA-256 678d9ca79e3495ed…

MALICIOUS

PDF

86.3 KB Created: 2021-04-17 07:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3789b16b866359301eeea0e72ffb35d4 SHA-1: ad36eab71dcbd33286017f9ba734c15c3490351b SHA-256: 678d9ca79e3495edd535f5a91f9083277fa3f9d115068e0914d578ddc138ef78
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

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 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://xezojetit.ru/strik?utm_term=charcoal+grill+with+side+smoker+box PDF link annotation
    • https://cdn.sqhk.co/bikegola/9gh9Ngi/harga_vibration_meter_fluke_805.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385852/normal_604fa5e6263c9.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/xQja10A/52948554175.pdfIn PDF document text
    • https://kuzeloxowew.weebly.com/uploads/1/3/4/3/134330257/xudipegid-nilamaxube.pdfIn PDF document text
    • https://cdn.sqhk.co/simizekovogi/fRhg4zo/76742455186.pdfIn PDF document text
    • https://cdn.sqhk.co/suwinodujeja/rhijio3/install_video_looper_raspberry_pi.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/Ik3jiuq/wufusipeneromifimuzepo.pdfIn PDF document text
    • https://baluwona.weebly.com/uploads/1/3/4/6/134611665/kegidedifajuzebebozo.pdfIn PDF document text
    • https://cdn.sqhk.co/firavibaw/doNRZid/51081934006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387825/normal_603e9a1da535e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417830/normal_6033b20c65557.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459631/normal_605d325eeba74.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/jixerubowi/windows_7_32_bit_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/munewu.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/27693423291.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/wufexomewe.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/android_app_development_tutorial_kotlin.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/tomobava.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/hierophant_persona_5_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/bovudinosuwezipi.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_off00011342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11342 5624 bytes
SHA-256: f142afc24912c00f7ab7707c79f874415534e17a83b265aa9d934f29870c1724
font_01_sfnt_off0001263a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263A 11280 bytes
SHA-256: b282bade1987741082f5014ebb347c7c65e9ec6083fcf4aec7f9e0e7161548c4

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