Malicious PDF — malware analysis report

Static analysis result for SHA-256 72998800fceccdd0…

MALICIOUS

PDF

80.0 KB Created: 2021-05-03 19:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f1bc5cb56840ed71201d82641b50818f SHA-1: 10a399798e6b5dcc2c4f29c9f49a7cc78f5faf96 SHA-256: 72998800fceccdd035d1350ee161221ced32f112d13c30a2eeb6a8bd9496017b
126 Risk Score

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://mezovuduw.ru/strik?utm_term=animation+movie+maker+app+for+windows+7 PDF link annotation
    • https://cdn.sqhk.co/jiguluzufuwa/zgggdG0/ny_stock_market_opening_time.pdfIn PDF document text
    • https://cdn.sqhk.co/tinodifozeza/jNzgiif/new_mega_ramp_crazy_car_stunts_games_2020.pdfIn PDF document text
    • http://sodahub.pro/nirowizusivumezuzurid9desi.pdfIn PDF document text
    • https://cdn.sqhk.co/mubafazus/3Jogiev/panawetaniravunobutawofud.pdfIn PDF document text
    • http://intereriia.com/11820600286i2c38.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://trenolgia.buzz/gekalalede7scro.pdfIn PDF document text
    • http://latencfsrt.space/facial_diagnosis_of_cell_salt_deficiencies_download5da7s.pdfIn PDF document text
    • https://cdn.sqhk.co/tegatiwuwax/dIjhjjj/25218802305.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jigigapapidafe.epizy.com/jofivuzaxuvoriv.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/94925162864.pdfIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_b2f3095d03a74ababa13211372d8854e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/xarodewatigifuvarosuxumo.pdfIn PDF document text
    • http://jifexizeji.epizy.com/acrobat_reader_10._1_4.pdfIn PDF document text
    • https://7980b0ff-2efe-48f4-a442-6c87bca80713.filesusr.com/ugd/9bd8c3_f086d0237618484ea8fd1bea88a14fd4.pdf?index=trueIn PDF document text
    • http://kuporalegumema.epizy.com/dosix.pdfIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_1831eb0ca0734eb5ba7809234f66fafd.pdf?index=trueIn PDF document text
    • http://fibotemirazopo.rf.gd/jaina_build_guide_hots.pdfIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_9302877d38384b2c8b5833311265f61e.pdf?index=trueIn 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_off0000fbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 5440 bytes
SHA-256: 818dd0b9096c6320eaf85d76e8c82f4052431468ed35b77b16aa1af1d28d8cc7
font_01_sfnt_off00010e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E86 10704 bytes
SHA-256: 5d2ad728539f0eb86faa2b9e3f68f57e27b9d92a180fb00e23b070c92444b1eb

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