Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e5a556ccdb3be3…

MALICIOUS

PDF

80.1 KB Created: 2021-04-01 21:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4cbd9d200015e30f47bd46982687ad3f SHA-1: 19df6da1fa7f20a8544c382b9c17bc1f7cae8dde SHA-256: 84e5a556ccdb3be3484b97a0279db4f3b9aa0734ff28c4efe94658dcffc5a0cd
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 0.9997

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://baarspo.ru/wix?keyword=practical+guide+to+real+estate+taxation+pdf PDF link annotation
    • http://cmbmarketing.agency/zelda_twilight_princess_gamecube_iso_espaole4atq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496216/normal_5fe3de70a7e0d.pdfIn PDF document text
    • http://bloodcraft.online/73907291841e1k6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446650/normal_5ffc58823dbd2.pdfIn PDF document text
    • http://getcreditreport.info/good_coaching_philosophy_examplesseo9x.pdfIn PDF document text
    • http://mugatazujiririv.iblogger.org/68706434039.pdfIn PDF document text
    • http://sedouche.xyz/796881836661hpxn.pdfIn PDF document text
    • http://uscarinsurance.info/12283711174eccc6.pdfIn PDF document text
    • http://bit7.top/masayoshi_son_biographyb9y18.pdfIn PDF document text
    • http://vpntop.info/14589013636smz7i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472495/normal_60278e32a09db.pdfIn PDF document text
    • http://loveworld.club/9441714685a1s5g.pdfIn PDF document text
    • http://fragcups.com/40939825312bxt2y.pdfIn PDF document text
    • http://xazamobi.66ghz.com/80620830420.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/08ae048d-e1db-49d5-8613-d6a3ba8cb8ce/ultimate_frisbee_equipment_list.pdfIn PDF document text
    • http://zalowakudedakov.rf.gd/dividing_fractions_worksheet_year_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d068f31-86d5-474d-9f7f-5d4eecc9ea74/46311216418.pdfIn PDF document text
    • http://fotisojaz.rf.gd/44777092709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dd1054d-e03e-4594-bc11-58470e7bf775/patadewomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17b0d8e0-d0ab-45ff-bbf9-00ddaa45d7bd/minn_kota_riptide_55_t.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31cd1379-0447-47e4-9ed2-6a753781ca5b/speed_of_trust_summary_youtube.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_off0000fae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE5 5392 bytes
SHA-256: fd2ea7cc1a8fe2a62b26b5bb761256342c4ce830cceeb9fbc7652e55a44039d4
font_01_sfnt_off00010d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4F 11156 bytes
SHA-256: 044d016719ed2ebf43c0a3837008639e6c3590a49e8eed9470a76c5b591420af

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