Malicious PDF — malware analysis report

Static analysis result for SHA-256 178b99a95a0e4ff6…

MALICIOUS

PDF

79.0 KB Created: 2021-02-20 03:02:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 33f8a2a5dfd3df10a6a9a074d3237ff8 SHA-1: 529d5786655a4225a6e93777d909ac187ef8e524 SHA-256: 178b99a95a0e4ff6c96541a975cd15267a4a4fb611507a97f00877db7fad6ac8
214 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • 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://yafferge.ru/strik?utm_term=samsung+nx3000+als+webcam In PDF document text
    • https://cdn.sqhk.co/sewuvavimebi/eBYjcje/mikecrack_skin_minecraft_pe.pdfIn PDF document text
    • https://cdn.sqhk.co/bitulore/e5TCgeX/aliexpress_short_lace_front_wigs.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/igj8hhF/monster_truck_show_nashville_tn.pdfIn PDF document text
    • https://cdn.sqhk.co/toviranevu/jPziakA/asteroids_definition_synonym.pdfIn PDF document text
    • https://cdn.sqhk.co/pewowutefiw/rbYgKid/9891611877.pdfIn PDF document text
    • https://cdn.sqhk.co/pimepojuti/jhioapC/gitubutuvugoze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498868/normal_5fda82bd7d9e7.pdfIn PDF document text
    • https://cdn.sqhk.co/timugulirebu/jw1bz3S/40947536444.pdfIn PDF document text
    • https://bumiwawewa.weebly.com/uploads/1/3/5/3/135343946/7495494.pdfIn PDF document text
    • https://poduxerot.weebly.com/uploads/1/3/0/7/130776630/fazifizipagamopilebo.pdfIn PDF document text
    • https://mimasalidapu.weebly.com/uploads/1/3/4/4/134466186/wisizisukatipimev.pdfIn PDF document text
    • https://xunilizavokuniz.weebly.com/uploads/1/3/6/0/136050149/lijunuzujibo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412762/normal_6024a18c5623c.pdfIn PDF document text
    • https://cdn.sqhk.co/notizejamebo/gcojftl/sony_srs_xb12_instruction_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/24390634567.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/69314576486.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/sesulerisisimujejo.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/antecedentes_historicos_de_la_fisioterapia.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83B 2960 bytes
SHA-256: 3a99bfcc8a6322cb1f5d9dd0c76c95525b0630114fc12c53a342d41e6b6e0e01
font_01_sfnt_off0000f2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AB 5732 bytes
SHA-256: b5eaafe0706e369700b26dd8c8eb04478202b0be6c65c6fd4243b28351f22902
font_02_sfnt_off00010638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10638 11900 bytes
SHA-256: 71cedbf2b129053a8744d32f78ea85df673867321302451d3e7da7ca3ca60390

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