Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3dc58a4f8087e4d…

MALICIOUS

PDF

55.7 KB Created: 2020-10-08 00:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b589efdaf1092f3448f939659bfabe61 SHA-1: 62563c511882f008f64ea013a83e406504760c50 SHA-256: c3dc58a4f8087e4dc3307b352a5dd017135c402d17a9f1d22fcaf4dde0473506
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a critical finding for a redirector link to known malicious infrastructure. The document body contains embedded URLs that appear to be part of a link farm designed to direct users to potentially harmful content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?keyword=cbse+syllabus+for+class+12+biology+pdf In PDF document text
    • https://site-1039958.mozfiles.com/files/1039958/fatukumusuvoxemima.pdfIn PDF document text
    • https://site-1039324.mozfiles.com/files/1039324/biwil.pdfIn PDF document text
    • https://site-1041766.mozfiles.com/files/1041766/4981151505.pdfIn PDF document text
    • https://site-1036646.mozfiles.com/files/1036646/12988671143.pdfIn PDF document text
    • http://repaketi.2020pray4galway.com/uploads/1/3/1/6/131636665/melilabefukogim.pdfIn PDF document text
    • http://gunavux.jenroweaicp.com/uploads/1/3/2/7/132741100/bapimoj-didivopefum-sapiduraju-wiwejakidexof.pdfIn PDF document text
    • http://xaxin.propertyhomes.org/uploads/1/3/0/9/130969352/janux.pdfIn PDF document text
    • http://woduge.winchmorehillbaptistchurch.org.uk/uploads/1/3/2/7/132712593/6b8f79bb513d.pdfIn PDF document text
    • http://suraw.lostlove.co/uploads/1/3/0/7/130738973/moxod.pdfIn PDF document text
    • http://xidigo.kaleidoscopechurch.org/uploads/1/3/0/7/130775050/julurovib.pdfIn PDF document text
    • https://site-1037113.mozfiles.com/files/1037113/63912495075.pdfIn PDF document text
    • https://site-1048529.mozfiles.com/files/1048529/49878526119.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00006e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E49 5656 bytes
SHA-256: 2c092014dbc8ed9b6798665ef971504b3a082023ae1efcb0a03f2e3d7780f627
font_01_sfnt_off0000819b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x819B 6568 bytes
SHA-256: f951ebc430affdff401f7b32ee909ff32ffb15670a665900fcf797e47cb196ec
font_02_sfnt_off0000942c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x942C 10508 bytes
SHA-256: ee5c2454ab2493970216f20815531145ef9c275a989f5d6ae53f2c8d849a0e0c
font_03_sfnt_off0000b80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80A 17492 bytes
SHA-256: b2b92fcd2919487c650493c91add21b847ed7c13e64e38272e25808cac974a95

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