Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a5a82b7c628aa8…

MALICIOUS

PDF

71.4 KB Created: 2021-03-20 11:54:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e41e47bab8a2bbae4107a1873a7091a6 SHA-1: 5f22786a602e3542a0313ec36fbdd955d4589c7f SHA-256: 81a5a82b7c628aa8ada897c5c9046e603b6a98385b19b863d2f2c5153e38f8a9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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 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://midufefew.ru/123?utm_term=exercise+adjective+or+adverb+exercise+1+answers PDF link annotation
    • http://mritzoliver.design/photo_editing_software_download_for_pcptzqv.pdfIn PDF document text
    • http://fc-aromat.ru/zexekibovol50s2.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/ZQRghhV/74592507706.pdfIn PDF document text
    • http://intereriia.com/sunumutavitg83.pdfIn PDF document text
    • https://cdn.sqhk.co/dexizajifu/jb9hehq/gasanejelidedupotanapulu.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/53368301700ns0ro.pdfIn PDF document text
    • http://setofexperience.site/how_to_use_cisco_phone_7945iixn4.pdfIn PDF document text
    • http://max-lifting.store/xojegexojogizetaguhqjez.pdfIn PDF document text
    • https://cdn.sqhk.co/mewivupa/hdhbwk0/vagoguwanene.pdfIn PDF document text
    • http://hs-life.ru/barrons_ap_physics_c_books13ho.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/pobixedele/xogozozapugejemezavodem.pdfIn PDF document text
    • http://rivuwasiwitovud.rf.gd/betet_2020_result.pdfIn PDF document text
    • http://jexogom.rf.gd/where_can_i_see_live_stock_prices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e326d26e-bc86-4dca-88d2-98c1446a1c21/can_you_drive_alone_with_your_permit_in_massachusetts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/119f909d-e890-44ba-b049-e48fd7b81d5c/luwadapasefomepas.pdfIn PDF document text
    • http://vagilamiporaw.epizy.com/occurrence_book_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/xikagudemil.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/smart_wristband_user_manual_4k.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_off0000d9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A1 5344 bytes
SHA-256: d9e2dd9dd8bc7436bdd11c640c1ff05f61d856c592f721b3eb3da1fb784d81b5
font_01_sfnt_off0000ebfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFC 11212 bytes
SHA-256: 801a83a634c804984300ff4cab797cc91ba94f94ef296a65f5bcfe6534088006

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