Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5409df7c8f83787…

MALICIOUS

PDF

90.4 KB Created: 2021-02-22 21:53:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: dd4ddd5c56f0884501ec8a6d0a71396b SHA-1: d22f132fb49d7bfb91d85edee34cd84caaad815c SHA-256: c5409df7c8f83787788744f65fc8f94686e05b1eb89b7b04a46c57239af91574
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://maypoin.ru/123?utm_term=navpers+1070%252F606+pdf PDF link annotation
    • http://kanijakagiw.iblogger.org/35416462974.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/ihghIwU/become_a_teacher_in_florida_online.pdfIn PDF document text
    • http://tehnoprom.org/google_project_management_certification_scholarshipd366k.pdfIn PDF document text
    • http://kefikajutadab.22web.org/boy_story_album.pdfIn PDF document text
    • https://cdn.sqhk.co/belexewuwif/Ricfjab/kabato.pdfIn PDF document text
    • https://zodoxofavuzawa.weebly.com/uploads/1/3/1/4/131437464/e14e552eb95b.pdfIn PDF document text
    • http://kifenefazujiz.iblogger.org/razebakutajo.pdfIn PDF document text
    • http://startbastar.online/76438240111h7pny.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/ibfii81/soap_cutting_machine_in_ghana.pdfIn PDF document text
    • https://cdn.sqhk.co/retobumoki/giiebgf/pot_stickers_recipe_steamed.pdfIn PDF document text
    • http://sewasapeko.22web.org/wixejefaduditefinirip.pdfIn PDF document text
    • http://flowerport.store/android_mobile_phones_for_sale_uk1bcs0.pdfIn PDF document text
    • https://zunepijubu.weebly.com/uploads/1/3/3/9/133986973/7522355.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/jdgKOEF/stick_shadow_war_fight_mod_apk_home.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://satuvet.epizy.com/esc_ventricular_arrhythmia_guidelines.pdfIn PDF document text
    • http://vikoxip.rf.gd/musobavuzivoduwiferasatax.pdfIn PDF document text
    • http://jabenesejamuji.rf.gd/lomunividowi.pdfIn PDF document text
    • http://zukovijaxi.epizy.com/27807185354.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3E 5496 bytes
SHA-256: f7f6fa2af5c6860d5074a26433e55c4908865c53283441c14745fff3c6784f1a
font_01_sfnt_off00011f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1F 11620 bytes
SHA-256: 14067df89a01c356bec6860e6eb14c205aee76af058ed89ac679d02d5c715e9d
font_02_sfnt_off000146dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DC 16140 bytes
SHA-256: 2732c78df68b4531e26da51a256f0f9ab881cb8a96d1886ade34872d88eeece3

Open this report in the interactive analyzer, or submit your own file for analysis.