Malicious PDF — malware analysis report

Static analysis result for SHA-256 06f5fbfae90a6259…

MALICIOUS

PDF

71.9 KB Created: 2021-03-12 04:30:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 70ce1ffa339d73f57055221e00a42287 SHA-1: c05ce495fc6f981f7c216dda52775b237b71924c SHA-256: 06f5fbfae90a6259b629d51e5ee511f78bde33d1b7c79de54596c4dd18650c18
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/award?keyword=infecciones+causadas+por+bacterias+anaerobias+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380883/normal_600a76383acb2.pdfIn PDF document text
    • https://cdn.sqhk.co/mojikeke/fAiaheE/smart_voice_recorder_paid_app.pdfIn PDF document text
    • http://matroskin.space/avast_antivirus_crack_software_freehmo1n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369149/normal_5fc642816701b.pdfIn PDF document text
    • http://xofitazuregokud.mywebcommunity.org/yellowstone_campground_map.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468267/normal_600d38e318ea2.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/ihjdidO/clash_of_clans_private_server_ios_2020.pdfIn PDF document text
    • http://golosa-spasibo.ru/89172850172xm6o.pdfIn PDF document text
    • https://cdn.sqhk.co/guwewaxa/heaifA3/lego_super_mario_71360_adventures_with_mario.pdfIn PDF document text
    • http://kigumelez.medianewsonline.com/jonizetu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380707/normal_6012dc136b101.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/dL2Vhud/14019283402.pdfIn PDF document text
    • http://zahlungsservice-ch.site/40249930556a7mf1.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/5c453e31-6e99-45a8-90b2-4af768d076db/jomokifufusidedogokosu.pdfIn PDF document text
    • http://defakulid.atwebpages.com/bangla_islamic_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64a995a6-9a41-4380-8bb3-48b2523cb630/singer_portable_sewing_machine_instructions.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_off0000da88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 5196 bytes
SHA-256: 48d6b24816b3c7db532a99347050830b109824763778839a1ff410af158ae878
font_01_sfnt_off0000ec42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC42 11176 bytes
SHA-256: d1a6b63a733ad61c5d7672ec632c8ec0c481396b40089bfe52b3278a7126bff8

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