Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fdd1e5fe59c0e91…

MALICIOUS

PDF

75.0 KB Created: 2021-05-20 12:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8118db962216d5440036a36de14c5f4a SHA-1: d1fcd1170b648204bd66089890cc9eb4bc60fd50 SHA-256: 8fdd1e5fe59c0e91144e536fc8732a6a6b55ca2512cd7ed31de975682af5b97f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO link farms to manipulate search engine rankings or to redirect users to malicious websites. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this behavior, indicating a high likelihood of malicious intent. The embedded URLs, such as https://jacksth.ru/strik?utm_term=monroe%2527s+motivated+sequence+outline+example, are likely part of this redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=monroe%2527s+motivated+sequence+outline+example
    • https://giduzuzetedeze.weebly.com/uploads/1/3/4/8/134853145/8190628.pdf
    • https://cdn-cms.f-static.net/uploads/4410015/normal_602574f3edd68.pdf
    • https://wakaxizuso.weebly.com/uploads/1/3/5/3/135322555/zikiruv.pdf
    • https://bijimuxe.weebly.com/uploads/1/3/4/8/134886115/xonezepofisi-bekimupunanit-noxemu-likofozuwo.pdf
    • https://static.s123-cdn-static.com/uploads/4489722/normal_5fe2d2b93f863.pdf
    • https://kazenatujexisof.weebly.com/uploads/1/3/1/6/131637291/minagife_nudosutugujime_bigunuk_lujenodik.pdf
    • https://static.s123-cdn-static.com/uploads/4471959/normal_600153fbcd833.pdf
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5fd6546d3d102.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/11621bde-ba23-48e0-81ba-a44fe7e7cd5b/what_is_the_setting_of_the_way_to_rainy_mountain.pdf
    • https://s3.amazonaws.com/sajatofubote/harbor_breeze_fan_remote_replacement.pdf
    • https://s3.amazonaws.com/kezemiradigu/bibebujufegufor.pdf
    • https://uploads.strikinglycdn.com/files/c8c741e9-0729-4e9e-9f7d-dbe70b1adee6/39036471060.pdf
    • https://s3.amazonaws.com/muwomapotumugi/31394413995.pdf
    • https://uploads.strikinglycdn.com/files/2d5be51c-6a73-4d1d-bbfc-20e82114d29c/how_do_i_open_sandisk_secure_access_vault_on_mac.pdf
    • https://uploads.strikinglycdn.com/files/a4dadff6-713d-4ba5-98d2-88020a770ad0/delta_rockwell_20_bandsaw_tire.pdf
    • https://uploads.strikinglycdn.com/files/6682e2e2-0a7d-4e45-b34c-3f5a2540aff4/dodemiterukoke.pdf
    • https://uploads.strikinglycdn.com/files/f68fc5e3-fcea-4e1c-a6c7-768452b03d07/any_recalls_on_2014_chrysler_town_and_country.pdf
    • https://uploads.strikinglycdn.com/files/80f56426-b40a-4e79-b6c2-7069362f6958/2016_street_glide_maintenance_schedule.pdf
    • https://uploads.strikinglycdn.com/files/d6c59639-b4d3-4493-a0f4-b0e0cd6c17aa/paromexelubamumoxiwejod.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_off0000e422.bin
8e27e9fb3c15d2b5c637d0dbb71529723b31934955c80469ced0b67d2dade2d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 5512 bytes
font_01_sfnt_off0000f6e3.bin
f1d591c590447b8ea8b9a41bcc56472d8f2735250f9347591278d83d53599551
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 11240 bytes