Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3402e86f3495e2…

MALICIOUS

PDF

85.7 KB Created: 2021-03-24 18:03:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5cf543f3667c87eb5d2736f177571769 SHA-1: 3372e3f76f4cfe44c71447c4914c264b4ddabe20 SHA-256: fb3402e86f3495e2bb5bd0ca3a773d1deb9f6f7f62306a20d29f7aed75327b95
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 0.9996

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://crophysi.ru/wix?keyword=destiny+lfg+discord+ps4 PDF link annotation
    • http://sugakibabusu.scienceontheweb.net/27525566477.pdfIn PDF document text
    • https://cdn.sqhk.co/salaseli/sichjge/53783537654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476593/normal_601de76f094b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416802/normal_6011db314ac70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481830/normal_60527e58588b1.pdfIn PDF document text
    • https://cdn.sqhk.co/revowemerem/7Gjibjb/3875556060.pdfIn PDF document text
    • https://cdn.sqhk.co/pogadidotilu/Ujbjihj/sk_lavery_newington.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://s3.amazonaws.com/sojebelevenex/js_uncaught_referenceerror_require_is_not_defined.pdfIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_75e67b5d866844b58ebfe462985d5160.pdf?index=trueIn PDF document text
    • http://jazopizebe.atwebpages.com/bokevidolugamasobufu.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/ayyappan_swamy_songs_tamil.pdfIn PDF document text
    • https://2ddf8be6-044d-4f30-b6fd-16c032829cd6.filesusr.com/ugd/9827ea_cb64e72972ed424f981987561a7d4d55.pdf?index=trueIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_8a58885edbcf4627af77ebecc523a2ed.pdf?index=trueIn PDF document text
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_5c7bbac4c744481ca2574fddd06e5f55.pdf?index=trueIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_c8f5c76157e546699a37f58ed8396647.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 5684 bytes
SHA-256: a1d4b4ef63028827178241b03ad21f71b37cc5aca084a3cd06c9f9e03f503cc0
font_01_sfnt_off000100c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C2 5092 bytes
SHA-256: 4b942eb7c6586a4008864f1d636183712fd9cb0a3a68ba6c50dc5b0ff6e5913a
font_02_sfnt_off0001122d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122D 12464 bytes
SHA-256: 0112cbe01acaee5d9e4afbb30cbab55b4bc8294e2b31e6a8a277c4827fc49fc5
font_03_sfnt_off00013b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B26 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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