Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2bc531632a9fd41…

MALICIOUS

PDF

78.9 KB Created: 2021-02-28 18:42:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 496e6ef80a13b072d9aec9f5101a7f09 SHA-1: 91adef240b6ca9bb4227c07612096249513ebfb8 SHA-256: e2bc531632a9fd41945542908a0b6a026c804270a12e35f8213dce798aea55a1
186 Risk Score

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=broward+county+sample+ballot+2018 PDF link annotation
    • http://dakisemakegag.sportsontheweb.net/26887870253.pdfIn PDF document text
    • http://nefodela.22web.org/what_is_news_now_fox.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/ggMiegf/call_of_mini_zombies_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/wibetaxor/2OHgjhg/11301627199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410004/normal_6031abb02a37c.pdfIn PDF document text
    • https://pulogumofus.weebly.com/uploads/1/3/0/7/130739416/8023027.pdfIn PDF document text
    • https://cdn.sqhk.co/zolulesar/r2o58hg/wood_wall_art_ideas.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/how_to_draw_anime_fast.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366385/normal_60081712c7e63.pdfIn PDF document text
    • https://cdn.sqhk.co/kogewole/jezfoji/my_business_manage_your_business_meme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_601c5bab719d6.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzitomizaj/Ojfhija/get_a_list_of_installed_apps_iphone.pdfIn PDF document text
    • https://radufogerexe.weebly.com/uploads/1/3/4/2/134265868/bitex.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvatagukas/0jZibib/snowden_movie_review_imdb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kenasaxoxaxober.rf.gd/dawigugi.pdfIn PDF document text
    • http://bepibuxel.epizy.com/97361038716.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BA 6120 bytes
SHA-256: b2a43294d27007a1dc9574665b4401b2191ce8d4b659de10bde8ccf53778cf02
font_01_sfnt_off0001098a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098A 10812 bytes
SHA-256: 6312761182b1ad0ac93915427b38a83148acc49ee42e3d00b6d71b5683441e59