Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae8f76e827ce20a…

MALICIOUS

PDF

69.1 KB Created: 2021-03-27 20:06:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1cd2ee82b4ee4f6a7bf706bd31dd6290 SHA-1: c9d642a3a23f1b6fd4919c2549ebf816b67b99d6 SHA-256: bae8f76e827ce20a0f2b9f6435e84a21ca655930317d62e148cb068cbf42f953
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=aso+exam+pdf PDF link annotation
    • http://xezojugudapele.iblogger.org/the_secret_life_of_pets_2_full_movie_youtube.pdfIn PDF document text
    • https://nojovuwu.weebly.com/uploads/1/3/4/6/134614298/de434feb3ed.pdfIn PDF document text
    • https://matamelo.weebly.com/uploads/1/3/1/3/131384575/4417484.pdfIn PDF document text
    • http://migunovaj.iblogger.org/malware_antivirus_for_pc_free.pdfIn PDF document text
    • https://lumosezuto.weebly.com/uploads/1/3/4/4/134499790/f232275.pdfIn PDF document text
    • http://creditscoretracking.info/41514123483u94sp.pdfIn PDF document text
    • http://it50save.info/timex_ironman_battery_removalpl926.pdfIn PDF document text
    • http://idclick.cash/fallout_4_perk_chart_poster_sizehxni6.pdfIn PDF document text
    • http://ritual-venki.online/jevomdq4o9.pdfIn PDF document text
    • http://golden-bridge.pro/togaxamovr0bum.pdfIn PDF document text
    • https://naxovemunozi.weebly.com/uploads/1/3/5/9/135958864/0d9880f75.pdfIn PDF document text
    • http://goduvide.22web.org/60766404056.pdfIn PDF document text
    • https://gojenegitoz.weebly.com/uploads/1/3/4/3/134387591/karip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://galiwasik.rf.gd/bahaya_kandungan_rokok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac23ec1b-d02d-4620-b77f-c17c8d8f262b/39153735422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b523113-05e5-4cff-8094-18835675019f/42012661906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b813e6c-d81b-44aa-b733-110e81305f48/physics_book_resnick_halliday.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_off0000d207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD207 5116 bytes
SHA-256: 94445c664b74d2b83a136836d86403f7a74ddd329901e9aed7edc66a583fee2e
font_01_sfnt_off0000e36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36A 10672 bytes
SHA-256: 144c32c1192c04df6cf224c9cf4621c6a9ab824ae5b699c4ae073ac38f5c4dcb

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