Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae6543e03bd6e5ec…

MALICIOUS

PDF

82.7 KB Created: 2021-05-06 07:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6df3479cd2cd734c767d9b1e025078ea SHA-1: 1d157e814cf40d04afd44b45077423c2de417bf8 SHA-256: ae6543e03bd6e5ec73b864ee1275615036d7d4936a1e3b9361b79bb73acbce30
134 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. It uses an urgency-based lure. 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://bologen.ru/strik?utm_term=blood+bowl+rules+2020+pdf PDF link annotation
    • http://romeita.fun/36235149231f4ed4.pdfIn PDF document text
    • https://cdn.sqhk.co/didowolikex/PO1thfi/zitifa.pdfIn PDF document text
    • http://ig-copyrightviolation.com/propiedades_mecanicas_de_los_metales_definicionj4tgh.pdfIn PDF document text
    • http://kmikaerfs.ru/tafivodebajimotafopdvp6.pdfIn PDF document text
    • http://legko.travel/logitech_surround_sound_speakers_z506_how_to_connect_to_pc4d1pk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457847/normal_606e31e84331c.pdfIn PDF document text
    • http://raisinsapp.club/80015631587ohknp.pdfIn PDF document text
    • http://donbetosstreettacos.com/zabisomotadsk3im.pdfIn PDF document text
    • https://cdn.sqhk.co/nomavunut/ghjb9jd/jiberexigeri.pdfIn PDF document text
    • http://rabota-plus.club/lol_patch_10.23_release_date_philippinesa4bi0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445754/normal_5fff4d6a171ac.pdfIn PDF document text
    • https://cdn.sqhk.co/mojikeke/6ie3ihj/zuzuwesuvax.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/86ae99b0-2411-4b0d-b77e-f9562b2ff339/42686702666.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/garmin_gps_128_price_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/28216626898.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/90171884152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92a81176-5c55-4299-b390-1555df3aa841/90554079933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f0d2184-7925-4c81-bb18-ae12e6d36ff8/dell_latitude_e6530_drivers_download.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_off00010132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10132 5380 bytes
SHA-256: 1d145173a1eaea88d6b8a15282943dfdf26910ed889c8929789bc6f0e4b388aa
font_01_sfnt_off0001139f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139F 11876 bytes
SHA-256: b01ef3b15575103935c3c969952465c9f85dafe25e4e99366cc87de8569bd220

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