Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d0c1ce3127facea…

MALICIOUS

PDF

123.6 KB Created: 2021-04-22 10:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e3a87f91cb124dfcb3277d344a90a431 SHA-1: 2564fd4c93b6cd51496c36e3ca9ffb6833ffbbde SHA-256: 7d0c1ce3127faceaaf2c209c81c032117d8ca7b181b69fd332e741830d4a64cb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=reading+body+language+and+facial+expressions+pdf PDF link annotation
    • https://gujukabexarum.weebly.com/uploads/1/3/4/8/134864796/zazexusifetufe.pdfIn PDF document text
    • https://sonefexezeripu.weebly.com/uploads/1/3/0/7/130739000/nekesa_minabilemom.pdfIn PDF document text
    • https://renudufodajofi.weebly.com/uploads/1/3/4/8/134884992/dadipawifula.pdfIn PDF document text
    • http://rokamik.iblogger.org/monthly_meal_planner_template.pdfIn PDF document text
    • https://zusiwugebibod.weebly.com/uploads/1/3/4/4/134484471/xitifawovaj.pdfIn PDF document text
    • https://joletumutete.weebly.com/uploads/1/3/4/8/134871701/nipalusuvulatu_fajiva.pdfIn PDF document text
    • http://sexesex.site/lutebomuvilepdicqa.pdfIn PDF document text
    • http://gonalotuturopil.mywebcommunity.org/43490219357.pdfIn PDF document text
    • https://bazodezivif.weebly.com/uploads/1/3/6/0/136088162/junitirezozabi-borofokad.pdfIn PDF document text
    • http://reactivaperu-2020.com/xozogipazcs5.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/tivizij.pdfIn PDF document text
    • http://likelid.xyz/defiant_electronic_deadbolt_manual4pbeh.pdfIn PDF document text
    • http://natosabi.mygamesonline.org/el_aprendizaje_autonomo.pdfIn PDF document text
    • https://fejunula.weebly.com/uploads/1/3/4/3/134363834/xexozuxugav.pdfIn PDF document text
    • https://zidovularirijap.weebly.com/uploads/1/3/4/7/134718784/2335666.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/60759729717.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/ancient_history_r_s_sharma.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://mopepuveg.epizy.com/brassage_genetique_cours_terminale_s.pdfIn PDF document text
    • http://forojiwimudobo.atwebpages.com/lonisimolunu.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
    • 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000186d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186D1 6500 bytes
SHA-256: 489a57b1f421deae89343cea16350603da2eb506c6db160a7681e40cb6d3c5f0
font_01_sfnt_off000196e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196E3 5444 bytes
SHA-256: 3dd91fe5877fa7521f7a86f6b6c63bb8e146bec3a6c17730c25d723dc228d331
font_02_sfnt_off0001a973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A973 11304 bytes
SHA-256: b228b2829cd3cf137397f8c714957024f10f310d7eafd9054b697c58d79930b8
font_03_sfnt_off0001d043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D043 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176