Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a6e26eacede250…

MALICIOUS

PDF

119.4 KB Created: 2021-06-08 21:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46b48073e7a3a25975884e5dd662988d SHA-1: 4f065b8448464bc5444929f7735288c0faf040f4 SHA-256: 15a6e26eacede250d9ac6f22e02cd6ea78b6c9231e9c6e9e3c4feefc01de7228
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm designed to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://krisoc.ru/pbw?utm_term=kingroot+apk+2021
    • https://lenagalazipanom.weebly.com/uploads/1/3/5/3/135310064/39f0136.pdf
    • https://rosojuvawava.weebly.com/uploads/1/3/4/7/134719385/muper.pdf
    • https://sebumowuvuxeluz.weebly.com/uploads/1/3/5/9/135962316/cb2858fcb6b8d73.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5be08c49-88c9-44ac-adf7-e5e7d363de58/7_sins_of_memory_summary.pdf
    • http://redelaw.pbworks.com/f/degowote.pdf
    • http://nusuwoxub.pbworks.com/w/file/fetch/144415347/how_to_change_clock_display_on_apple_watch_5.pdf
    • http://depowota.pbworks.com/f/16203883029.pdf
    • http://zopilep.pbworks.com/f/ending_credits_law_and_order.pdf
    • https://uploads.strikinglycdn.com/files/c0f17161-7dc2-4b31-b6e5-12fede4d1bd6/misewekotag.pdf
    • https://uploads.strikinglycdn.com/files/ff4dfa31-c4cb-43cd-929c-eb6ea9079995/how_to_use_innova_3020_canobd2_diagnostic_tool.pdf
    • http://kuperuxowix.pbworks.com/f/46508871834.pdf
    • http://fovimuzozo.pbworks.com/f/55929066220.pdf
    • https://uploads.strikinglycdn.com/files/42077498-fd8b-43a4-97f1-b7f18f082e06/how_to_divert_phone_calls_telstra.pdf
    • http://rupebaxo.pbworks.com/w/file/fetch/144517542/58130246061.pdf
    • https://uploads.strikinglycdn.com/files/38510524-ba26-4f7f-830b-c56118b594be/excel_vba_range_select.pdf
    • http://magesob.pbworks.com/f/81968086427.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000198d1.bin
b541cc1c42673ef029ee8b56e911db72eec9907d1dcb8cf7b3aa96f023788170
pdf-font-stream PDF embedded font (sfnt) at offset 0x198D1 5136 bytes
font_01_sfnt_off0001aa66.bin
7743ab0c569037360bda6192ad9091cfe10760caf355d06eebb4027505cc3021
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA66 11264 bytes