Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d456d05273b58c5…

MALICIOUS

PDF

74.8 KB Created: 2021-03-19 09:51:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a79460d4f5655ca0522dafb2f8b95d2 SHA-1: 9c03d670c34d3308e4ec24f86af5de1e00897bca SHA-256: 5d456d05273b58c56acc69175313683aec53c8a30f98daa224bfb500e2d5deea
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, references 'Toastmasters competent communicator manual evaluation form', likely a lure to entice users to click on the embedded malicious links.

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://lozipotod.ru/wix?keyword=toastmasters+competent+communicator+manual+evaluation+form
    • https://falesejus.weebly.com/uploads/1/3/1/4/131483218/nedofepifam_dofukotalagi_kiketutugotixug_nabikapem.pdf
    • https://guzuwifaxad.weebly.com/uploads/1/3/4/0/134096987/gefaxotubitataja.pdf
    • https://vukojudal.weebly.com/uploads/1/3/5/3/135317211/diratakifojenakibuw.pdf
    • https://fefirewaw.weebly.com/uploads/1/3/0/7/130775199/birugav.pdf
    • https://vumerajijo.weebly.com/uploads/1/3/2/8/132815742/nanodubefe-miramolit-futon.pdf
    • http://topukovatawosu.sportsontheweb.net/tilidutedalaw.pdf
    • https://totamozosapopa.weebly.com/uploads/1/3/4/7/134712517/tasetukerekuk-kuzedufedav.pdf
    • http://bowanizi.22web.org/viwegipex.pdf
    • https://bopisigo.weebly.com/uploads/1/3/1/4/131453919/025a82120e0c44f.pdf
    • https://zomurudol.weebly.com/uploads/1/3/4/4/134492975/5c1ba23.pdf
    • https://tomudonaki.weebly.com/uploads/1/3/4/7/134715401/laketenafos.pdf
    • https://fiwarurebel.weebly.com/uploads/1/3/2/8/132814972/4883309784dd5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dovofelemu.epizy.com/dujavog.pdf
    • http://wudokuzogikozu.rf.gd/le_guide_culinaire.pdf
    • http://xuresiru.epizy.com/depuf.pdf
    • https://s3.amazonaws.com/mizeteb/airtel_tv_for_windows.pdf
    • https://s3.amazonaws.com/fikuvine/30824453515.pdf
    • http://mifofoxidil.onlinewebshop.net/howard_miller_wall_clock_stopped_working.pdf
    • http://suginuzebaluwom.rf.gd/bhavesh_joshi_superhero_song_pagalworld.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_off0000e945.bin
ac0c6fe11d6a1c482e78e02e0724351dbe67283ddfc60728ab73d1ac9b8d60ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 5168 bytes
font_01_sfnt_off0000facd.bin
e30f65e7397cbc9b65feb8d07e9042687a169b09bd0083dab615862c2aa2bc94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFACD 10256 bytes

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