Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5550dcb97591ba…

MALICIOUS

PDF

104.3 KB Created: 2021-04-10 22:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2e340a208943e69e30fa816d2d049ede SHA-1: 74744e6b781157a6a50abc4ea058a48526340fa8 SHA-256: 9c5550dcb97591bac4d20e2b4a401481b5ecbfb20b832721aa098d392f6ec1d1
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://vilenefex.ru/strik?utm_term=transformers+revenge+of+the+fallen+movie+cast PDF link annotation
    • http://cmbmarketing.agency/template_for_critiquing_research_articlesk1utr.pdfIn PDF document text
    • http://j3vnci4.xyz/when_is_a_series_of_unfortunate_events_season_4_coming_outt5qsv.pdfIn PDF document text
    • http://usesalon.xyz/ncaa_division_2_football_scores8tezf.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/84435201311zp6bq.pdfIn PDF document text
    • http://jezojarugeboz.22web.org/86278925103.pdfIn PDF document text
    • http://faceit.su/jangro_cleaner_disinfectant_data_sheetxr56k.pdfIn PDF document text
    • http://com-connexion.xyz/violence_meaning_in_marathioi84r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vavale/14761651054.pdfIn PDF document text
    • https://0c241ebc-151b-48bf-a4db-a9f2ee65d67b.filesusr.com/ugd/c17081_5dbb24a952494e1ea1d07a79b2348c9f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/one_step_equations_with_fractions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35a370dd-8c7d-4513-afff-c3e795e6545c/50431144810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94951dd3-2f21-4a74-aa4f-4d603e0f8a7b/bulova_marine_star_automatic_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/462fe328-1c39-4400-818c-fb094fb839ec/pixel_survival_3_mod_apk_android_1.pdfIn PDF document text
    • http://sudiwoke.epizy.com/collaborate_excel_sheet.pdfIn PDF document text
    • http://tuzixuruwu.rf.gd/tavesexejejas.pdfIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_0154fda12ca74a0a9bdc450fb4d8238c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13833 9236 bytes
SHA-256: c2a75c087426492d17ce73f7d856e5d1d34163b107eb4b89f255762c6ab402b6
font_01_sfnt_off000156e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E1 5304 bytes
SHA-256: 97c2a7ec75ca367aa8aeb98a36466c9eea20b4f612d2858086dcd78f9221c589
font_02_sfnt_off000168cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168CB 13340 bytes
SHA-256: d1bab0561f6d84059bf601e900cb4be702b4ea02d9e6d4442eb84e0109630b18

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