Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f820bd0e78bdd5…

MALICIOUS

PDF

85.8 KB Created: 2021-02-20 22:17:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8b7d4ee8bb545e757721006f3fb4a6d2 SHA-1: 9316fd255608ca5f3b1b69df236cce5ece381051 SHA-256: 90f820bd0e78bdd5a0e9c4db578711c4911aff3d776da371db8b589630e98f23
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/123?utm_term=how+to+use+a+rice+cooker+basmati PDF link annotation
    • https://cdn.sqhk.co/xevuvuxene/kgizOAj/t_rex_3d_printed.pdfIn PDF document text
    • https://bunepefetupudir.weebly.com/uploads/1/3/2/7/132741430/4f29982aa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385413/normal_5fd632916830c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406168/normal_5fefab58aecb7.pdfIn PDF document text
    • https://jefiwoso.weebly.com/uploads/1/3/5/9/135996081/4972798.pdfIn PDF document text
    • https://mujolimu.weebly.com/uploads/1/3/4/8/134868529/11141dae4f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451350/normal_6015efc1c10c0.pdfIn PDF document text
    • https://mogopefisumiba.weebly.com/uploads/1/3/5/2/135295831/nipunirisexazex.pdfIn PDF document text
    • https://jitugexe.weebly.com/uploads/1/3/0/9/130969989/gonezanoxolemirolepi.pdfIn PDF document text
    • https://jarofipe.weebly.com/uploads/1/3/1/4/131408229/basomid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459162/normal_5fd0f032acab5.pdfIn PDF document text
    • https://nolipugi.weebly.com/uploads/1/3/4/6/134652161/8259770.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490274/normal_6008c6794c346.pdfIn PDF document text
    • https://wixoxane.weebly.com/uploads/1/3/4/7/134734379/rupotolozonineb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413347/normal_6001e42931af3.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
    • 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE057 4948 bytes
SHA-256: f058dd87780992a24222f2f8aa38db2f89510c12aea9876683235d85f7d41831
font_01_sfnt_off0000f140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 11036 bytes
SHA-256: a980a22005850770a4642d68d7e47c206edb7d0af202acc20845f4a6ef7813b5
font_02_sfnt_off00011712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11712 16200 bytes
SHA-256: 9e43e851498a6aae6ca2796a340e3093810d6046cb0c6c069cbdf99a655b16a8
font_03_sfnt_off00012c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
font_04_sfnt_off00013a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1E 6216 bytes
SHA-256: 33453ad6f701789d1dc61dbb2d0ef5d041761be449c1c0948682c75028a83583

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