Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad48bf2ad628c09a…

MALICIOUS

PDF

100.7 KB Created: 2021-01-12 23:51:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 99c7d72a4b5247c48aa00fa6037c0126 SHA-1: ef104e7e524d5679c617577fc472a2fdd4b86968 SHA-256: ad48bf2ad628c09a85d8c7ab0dbd55a20d05eda132c5ef69db9bba2fac464fbf
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 pointing to Weebly-hosted PDFs, which is indicative of a link farm or SEO abuse. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://trafficel.ru/123?utm_term=pathfinder+mind+flayer+race PDF link annotation
    • https://babuzusevajuwo.weebly.com/uploads/1/3/4/8/134878483/35d2a023fa33.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/09b03b.pdfIn PDF document text
    • https://vosovijuz.weebly.com/uploads/1/3/0/8/130813614/3885907.pdfIn PDF document text
    • https://tejikapor.weebly.com/uploads/1/3/1/3/131382395/sitiraje.pdfIn PDF document text
    • https://cdn.sqhk.co/vujalenan/hajfRz3/new_flute_ringtone_2020_download_mp3_pagalworld.pdfIn PDF document text
    • https://gosabejeda.weebly.com/uploads/1/3/1/4/131453015/fajur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/audible._co._uk_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/fofasomibopanipefo.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/madden_mobile_unlimited_coins_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/mewezekilafef/68520578892.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/ielts_band_9_reading.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/kindergarten_worksheets_english.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_off00014ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA4 5184 bytes
SHA-256: 55647aff38120024d326caf1505be413d37180451c8fe8d13fc8bd5b05e20f0c
font_01_sfnt_off00015d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D29 13316 bytes
SHA-256: 3aac26094555149421c0588a92b283cc2c203553558cab390bb4c077ee5947d1

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