Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8a25d81eaef8ec…

MALICIOUS

PDF

63.0 KB Created: 2021-02-14 03:03:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0ee724683b81dc8dbde1fb49dbfd9f4 SHA-1: 6657fcc30e7aa3c14d9f66a93edc25e11a228e9a SHA-256: ab8a25d81eaef8ec17ee4d84271fa7734eeb6e9ab70f81892eccc48838cae99c
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the ClamAV detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jacksth.ru/wix?keyword=makita+circular+saw+guide+rail+system
    • https://bikugepoxo.weebly.com/uploads/1/3/5/3/135351236/91b8baa.pdf
    • http://vuxokiwi.22web.org/2730379827.pdf
    • http://vashastrahovka24.ru/dozaziwegudumeriluvanojie2z88.pdf
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/kaguv.pdf
    • https://nukofagola.weebly.com/uploads/1/3/4/8/134883999/4977940.pdf
    • https://zetitazafoxiz.weebly.com/uploads/1/3/4/0/134040412/1671834.pdf
    • https://finuvowevemez.weebly.com/uploads/1/3/5/3/135397693/bujazenev_kerubul_mifawubedaxi.pdf
    • https://cdn.sqhk.co/rubekafux/gSHzihb/lugiviles.pdf
    • https://baputopozim.weebly.com/uploads/1/3/5/3/135336161/3179760.pdf
    • http://raicen.com/puzzle_and_dragons_guide_20186u9a8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vebisop/37659827550.pdf
    • https://s3.amazonaws.com/dotivaf/correcting_compound_sentences_worksheets.pdf
    • https://s3.amazonaws.com/nelizenejakarug/12461623483.pdf
    • http://komewubot.epizy.com/25923325940.pdf
    • http://wapinogure.epizy.com/41219088825.pdf
    • https://s3.amazonaws.com/kifutizijebuj/17012914300.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_off0000b820.bin
a4fb6e26649b2b54ecc249e4308822803f292376bb92f5f7ac609d3eeb5a5b62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB820 5520 bytes
font_01_sfnt_off0000caf8.bin
429bb7f501ee12d0b99336a118d22019efc1d15f74aff7f735d1756979bf9c96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF8 10040 bytes

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