Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7d8e18236a1566…

MALICIOUS

PDF

97.8 KB Created: 2021-06-14 06:40:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3f7922b8b93e435c892b44e32d0dc4b2 SHA-1: 18d9f5aba116efaea6a75e61d818795945d04e2c SHA-256: ba7d8e18236a1566c9fbe0562cd7a6ac1ebe0232ca6a20fbf68291153a9a686e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9991

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://fokemale.ru/123?utm_term=whatsapp+status++malayalam+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464319/normal_6015841b53051.pdfIn PDF document text
    • https://dibevoxatatot.weebly.com/uploads/1/3/1/1/131164568/kodejejub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474192/normal_6059a2888a30a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393763/normal_5fe47b458a56a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455377/normal_60bb1f27a4e1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462073/normal_5fca726d5639e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480589/normal_5fce8285b3329.pdfIn PDF document text
    • https://vanasukir.weebly.com/uploads/1/3/2/8/132815930/gituwax_pefazimow_gazojikikevob_sivofilepafil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454047/normal_6053063a7a7a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449009/normal_5ff62f2a01a75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412763/normal_606622dc55cba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416935/normal_602f305cf1a5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381964/normal_6008eb559111b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413110/normal_602d681660604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387928/normal_60480c6b621c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450641/normal_60b93f07a0387.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4462035/normal_60affbc08005d.pdfIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bamedun.pbworks.com/w/file/fetch/144631518/what_atom_is_the_largest.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/w/file/fetch/144518034/73376725256.pdfIn PDF document text
    • http://wojoxevom.pbworks.com/f/business_goals_1_students_book.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://gitlab.com/smc/meera/blob/master/COPYINGIn 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000fdff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFDFF 12220 bytes
SHA-256: b88170a1f1058fa04f4350441e311dc8f55ee24b5307d1e3942e05871f6c0009
font_00_sfnt_off0000deed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEED 3356 bytes
SHA-256: 7cf71cb5920c39b2290f9068270cc4ca500f1e214aa2608e237750bdec2f26fa
font_01_sfnt_off0000eb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB10 5596 bytes
SHA-256: 0b4e5f9119425c09e2f41d993074c9ed43fc6739cd203f4bb449359d8d75fd98
font_03_sfnt_off000126b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B4 3552 bytes
SHA-256: 4c5ba8bf41e4d684b12f3f7551de485fe7623360b07d33b414cc8028f821b79a
font_04_sfnt_off0001348e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348E 10568 bytes
SHA-256: 7d0884412a6e56b79b024b68beee0ce4fa517967905bf4418671aaeb07b33f1e
font_05_sfnt_off000158b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158B6 20272 bytes
SHA-256: f919983d1c5765987ed8cab151085422c3f26ad4dd5b1581196294afdb2e14b8

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