Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c919ebd32de952…

MALICIOUS

PDF

82.1 KB Created: 2021-02-18 08:50:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aca2061feacdfbc604141a715730d729 SHA-1: 1ab69b9423f9a7b202efd7accf67aa2f4a8d33ba SHA-256: 66c919ebd32de952a9b46b19bb7c81130dfecb1202764b097f522d9f7434bb4a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though partially corrupted, suggests a lure related to "how to code html for beginners", which is used to disguise the malicious intent of directing users to a network of potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wb?keyword=how%20to%20code%20html%20for%20beginners
    • https://cdn.sqhk.co/varomapit/YL8FLQO/vudidimejavu.pdf
    • https://masejufubalabej.weebly.com/uploads/1/3/4/3/134388341/wemagovojefo.pdf
    • https://cdn.sqhk.co/wixexozesila/jkibEDc/best_live_streaming_apps_to_make_money.pdf
    • https://zoxuzula.weebly.com/uploads/1/3/4/4/134489613/979492.pdf
    • https://cdn.sqhk.co/govulasem/XDZEt2d/13011348119.pdf
    • https://cdn.sqhk.co/kurafuso/Rghiehd/digital_marketing_manager_job_description_naukri.pdf
    • https://cdn.sqhk.co/subilikiwi/gggdjbF/satisfactory_hypertube_booster.pdf
    • https://cdn.sqhk.co/fuwufupi/tjgid4k/rupetifupoxi.pdf
    • https://cdn.sqhk.co/wogokodu/gggvBha/zofomiraba.pdf
    • https://cdn.sqhk.co/rijatazuga/cge3qhc/espn_football_rankings_2020_nfl.pdf
    • https://fenatinuzari.weebly.com/uploads/1/3/5/3/135314561/9776522.pdf
    • https://cdn.sqhk.co/ferobisuw/MHge3hi/62977679843.pdf
    • https://cdn.sqhk.co/pubamegumox/djiRiip/toca_hair_salon_4_mod_apk_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f289.bin
a84fe8ccebaadaec26c68754ff56ec47e75d3d52b13675d8f9989f8d4dc65369
pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 2872 bytes
font_01_sfnt_off0000fcc3.bin
8ee0e9e39d87e965640088985f63846ad005d98f958c4a7446826c6f4e9b18e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC3 5416 bytes
font_02_sfnt_off00010f1b.bin
e496ba812b777cdfab2ea2583fb740152e038e96ecbd6207889acda421a6a332
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1B 13880 bytes