Malicious PDF — malware analysis report

Static analysis result for SHA-256 527de2c34397a2ad…

MALICIOUS

PDF

83.9 KB Created: 2021-03-07 16:47:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b5950966aac84a3dbfe7a362ff0831e4 SHA-1: 54858be22b8181a349a8f807ddf96c95c9135722 SHA-256: 527de2c34397a2ad9559af8f52698e435b5362622e7376ef9d71c364dd21562c
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable domains and potentially malicious hosting, indicating a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is a tactic to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection further confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=similac+free+samples+and+savings PDF link annotation
    • https://cdn.sqhk.co/jezuleku/ad1Swhb/vugafaguzedimu.pdfIn PDF document text
    • https://nonoxatuvel.weebly.com/uploads/1/3/2/6/132681685/kanej_geduzek_rinunutewabogo_xadok.pdfIn PDF document text
    • https://junanopawakeza.weebly.com/uploads/1/3/3/9/133999625/xoxosugol_bifigu_lurim_zopegesiku.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/dgejeaH/chatham_emergency_services_employee_portal.pdfIn PDF document text
    • https://kilejotiwig.weebly.com/uploads/1/3/1/4/131406519/7459656.pdfIn PDF document text
    • https://monibobur.weebly.com/uploads/1/3/0/7/130776122/jugugusizaletij.pdfIn PDF document text
    • https://zivotawab.weebly.com/uploads/1/3/4/5/134576919/tukujifot.pdfIn PDF document text
    • https://tematurulabi.weebly.com/uploads/1/3/1/6/131606540/buzogiwiganibo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/efae711a-6a10-40ba-9158-94858b4b1f65/2220944289.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/89655144933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e098252-1c00-4978-83f1-a756cd7137ca/meselanovatedal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fba63ca-4147-4046-b416-0de3a375a9e3/common_shared_value.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/anonymized_information_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/vewesutefidunora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf0a701d-423a-425a-92c8-2d5221b2932e/why_cant_i_see_all_my_recordings_on_xfinity_stream.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22723401-e635-4ec0-b09f-f793ebca1a64/thule_lockable_roof_rack_straps_4m.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/14232820126.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/3940271866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c063e8c3-f60a-47d6-8139-d30f14b573e1/62590510235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/786a3c94-7141-4850-8e01-b006618d358c/sazulewatibepopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49e60666-96bc-47a5-a97f-223014d15a95/how_to_treat_water_bumps_on_skin.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86C 5236 bytes
SHA-256: 904b43b0deeeb8f6edfe186a5717cb7a94d2647cce97c679cb1ace108f7150ed
font_01_sfnt_off0000fa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA11 10480 bytes
SHA-256: 6a7c2cdd5c0ae6eb2147dbaca022a44d947065889af527f14a4962f605f755f0
font_02_sfnt_off00011e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E29 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15
font_03_sfnt_off000133b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B4 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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