Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac161276a6e3374f…

MALICIOUS

PDF

67.9 KB Created: 2021-03-08 06:36:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 94a127755b305c1bb2219a5c73fca485 SHA-1: e5bd9e4d48a3e0bf295f144e64118091eba98507 SHA-256: ac161276a6e3374fc371c3bd10deceec9a737ae3377dd6c1be55de4eac69c367
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://maypoin.ru/wix?keyword=la+catrina+episode+3+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474723/normal_5fe9730d32996.pdfIn PDF document text
    • http://mnclassis.org/revolver_paintball_guns_from_community9mv9c.pdfIn PDF document text
    • http://rentline.pro/toyota_production_system_bookrnenl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483081/normal_5fe157280c2b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412599/normal_5fec9d8adc62c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426062/normal_601749fbeb07c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490534/normal_601e8655447a8.pdfIn PDF document text
    • http://krokoboko6.xyz/78202595719cf9uv.pdfIn PDF document text
    • http://allieshouseofhope.com/vewokigizafodikunnwaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478923/normal_600b4e4a7ca36.pdfIn PDF document text
    • http://train-home.ru/cuanto_debo_en_mi_credito_fonacot3lu0c.pdfIn PDF document text
    • http://ig-soft-team.com/63954684605oi14w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527345/normal_5fc7dc969f17b.pdfIn PDF document text
    • http://vinograd.io/loxazatawus5h4f.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/5754ee50-dcba-42f6-b7e1-d55eac885d7f/how_much_does_a_waterpik_water_flosser_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7929e0cc-da75-4358-ab14-f5da9ad94ba0/lepasolumod.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/68568100909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f2637d-c97c-4cda-a12e-22d52b643c9e/samsung_washing_machine_vibration_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/cheng_tsui_chinese_character_dictionary.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_off0000cd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD64 5232 bytes
SHA-256: 0d4da8dad1b7b2132eb847794a19935313c7365b132d42ae474aa2a1264e46e4
font_01_sfnt_off0000df52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF52 10304 bytes
SHA-256: 102fd4c4a284198cad8363846a9c8dc674a851e72ec27384f09987f816ef443e

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