Malicious PDF — malware analysis report

Static analysis result for SHA-256 875fd383b44f8256…

MALICIOUS

PDF

81.9 KB Created: 2021-03-23 02:59:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: afb787b7c97c79f5bac6e1cbc2c17c50 SHA-1: 7f2f6b75ba820888a0a48bc11387a444a1fdca1c SHA-256: 875fd383b44f82560c6905769412a3fdccd31d6a1b71b09a4ae1d4f9865bedc3
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with at least one pointing to a domain associated with link farming and disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to PDF creation and potentially keywords that could be used in a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/award?keyword=anticorpos+lupus+pdf PDF link annotation
    • https://cdn.sqhk.co/nububufi/hgicUjb/walk_from_chatsworth_to_baslow.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/7jbkMja/81661070759.pdfIn PDF document text
    • https://cdn.sqhk.co/remudejifi/bGgL1gi/sezumumuwisazuteruxe.pdfIn PDF document text
    • http://nazawate.iblogger.org/aafat_naezy_song_320kbps.pdfIn PDF document text
    • https://cdn.sqhk.co/nigudovowa/ggjjGhj/kiwibejukiwabopijeb.pdfIn PDF document text
    • https://cdn.sqhk.co/linaxezo/KWhgjja/83636505027.pdfIn PDF document text
    • http://fuxakuzaporelu.iblogger.org/97497878815.pdfIn PDF document text
    • http://sujimelowakolop.medianewsonline.com/60691153485.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_2b69605d308b490b95d7466775a3dcd3.pdf?index=trueIn PDF document text
    • http://kowisefofob.epizy.com/69337686412.pdfIn PDF document text
    • http://rakutekapo.epizy.com/rujome.pdfIn PDF document text
    • http://jegovogetaferop.epizy.com/jifisutifanerugo.pdfIn PDF document text
    • http://safedoguno.onlinewebshop.net/article_worksheet_for_grade_2.pdfIn PDF document text
    • http://vefejabenu.rf.gd/addition_and_subtraction_worksheets_grade_1.pdfIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_03cd06ca7eaf4466b226503b7bc3eb71.pdf?index=trueIn PDF document text
    • https://574dee49-ee40-4737-ae02-340ce2b26f9d.filesusr.com/ugd/b44cf7_b5bb53adace84318afa23d5c53d2db71.pdf?index=trueIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_3e08f8cd71314d0c82ec19a6624fa4fa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/jazz_hip_hop_beats_instrumental_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/castlevania_harmony_of_despair_yoko_guide.pdfIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_21aa735180ef4ce7adeca9ad6d49c746.pdf?index=trueIn PDF document text
    • http://zamipux.rf.gd/69321151663.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/gosiforiratatavuwudibagos.pdfIn PDF document text
    • http://riwatarabopa.rf.gd/love_and_respect_conference_reviews.pdfIn PDF document text
    • http://ralavokapijalig.rf.gd/37340058330.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_off00010003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 4928 bytes
SHA-256: f71b36f8a4010d13df1269554ea277cc6728e3ce96f867ff5986084a9642dd48
font_01_sfnt_off000110dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DC 13368 bytes
SHA-256: 5439d1c9b93a424596cc0f11b3eb03b260354def01f9719e49d7af2204d815f0

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