Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9f81c48c2f3770…

MALICIOUS

PDF

80.6 KB Created: 2021-03-04 18:02:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 98eed79ec40b23596dbf6b06a9612aed SHA-1: de90a0906cfc365135c95e75513883774900a65d SHA-256: ff9f81c48c2f37704d5a3cb9648c58cd9de2155267f87fdd93a7376a8cdf0cfc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, suggests a lure related to search results, further supporting a phishing or malicious redirection attack pattern.

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://dugedepap.ru/wix?keyword=spectrum+tv+guide+kenosha+wi PDF link annotation
    • https://cdn.sqhk.co/lididiregi/gqjfHgd/realm_grinder_artifacts.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/mapa_espaa_transport_feverop8zy.pdfIn PDF document text
    • http://wozutujetotox.iblogger.org/92594283635.pdfIn PDF document text
    • https://cdn.sqhk.co/rewakevutel/ghcfhgL/bafukoduxogabotubirir.pdfIn PDF document text
    • http://sberbank.services/shark_water_slide_rental_miami8zfkd.pdfIn PDF document text
    • http://cz-nitrof.website/logitech_harmony_880_battery_replacement5arlk.pdfIn PDF document text
    • https://cdn.sqhk.co/subilikiwi/Yjdx7id/sunglow_motley_corn_snake.pdfIn PDF document text
    • http://babysampler.com/troy_bilt_2700_2.3_pressure_washer_partszh7ut.pdfIn PDF document text
    • https://minomawisagu.weebly.com/uploads/1/3/5/9/135956859/mubozumijolom_nujopaniv_jubufomamujo.pdfIn PDF document text
    • https://cdn.sqhk.co/sumefixes/vjgqMNm/90133877971.pdfIn PDF document text
    • https://rudarizegofuk.weebly.com/uploads/1/3/4/3/134355262/rinebile_dubogeva_miwagunilagi_suragotiba.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.website/59290552801hfsf7.pdfIn PDF document text
    • https://sunakolezapomuj.weebly.com/uploads/1/3/4/6/134698053/d12a8eeca5f2f7a.pdfIn PDF document text
    • https://venevivoxeda.weebly.com/uploads/1/3/1/8/131857756/49a4045f0c.pdfIn PDF document text
    • http://arenda-comp.space/sports_illustrated_covers_over_the_yearspwk4z.pdfIn PDF document text
    • http://latencfsrt.space/loberutinenopot4wbsp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luwefotikejumu.rf.gd/windows_app_sites.pdfIn PDF document text
    • http://bejopirobi.epizy.com/45216745135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abe97628-f8b9-4fab-9e52-3bf6a383ffd9/bikanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6163dc2a-8135-4457-9927-a91ec2e4e734/lazigazawasuwigabufovugos.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC22 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off0000fd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD09 5776 bytes
SHA-256: 59b5ec90f3d8209a5a9ecc2cab42f25fbb04235f9afe74f61f421085ed4af3d8
font_02_sfnt_off0001109f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109F 10628 bytes
SHA-256: 1983d0ad4ca6d23d261430a29f0d4734690f2dc903ff536f8e05eb1a0d14b353

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