Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b321069207cf30…

MALICIOUS

PDF

77.6 KB Created: 2021-02-25 17:42:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 95e5fbbc82ebbb6021fd29e7bb603623 SHA-1: dbc3df68e2913555959dc11e4d5669871e39f885 SHA-256: b4b321069207cf306b715a34f0cbc7d5e27457c4a4ab0236cbc911ac56716a13
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to disposable domains and a specific URL designed to lure users with a 'Planet Fitness sign up fee waived' lure, indicating a phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a phishing site for credential harvesting or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/strik?utm_term=planet+fitness+sign+up+fee+waived PDF link annotation
    • http://manamuposa.getenjoyment.net/nupuxupige.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452834/normal_6001017c4c8bc.pdfIn PDF document text
    • https://cdn.sqhk.co/babijuvawov/jQhcifR/mini_retro_arcade_machine_jb_hi_fi.pdfIn PDF document text
    • https://boxemafal.weebly.com/uploads/1/3/3/9/133997404/8783795.pdfIn PDF document text
    • https://cdn.sqhk.co/texivewa/bRWVdii/87709271998.pdfIn PDF document text
    • https://xakalawuvobovu.weebly.com/uploads/1/3/1/0/131071286/9777188.pdfIn PDF document text
    • https://rikusinifo.weebly.com/uploads/1/3/4/0/134017093/03d9540e54b360c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445544/normal_5fd6746e19933.pdfIn PDF document text
    • http://yesnutural.space/zukepigilasaxakejuguwiloulej3.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/fluke_networks_pro3000_probe_user_guide.pdfIn PDF document text
    • https://xevefozivoro.weebly.com/uploads/1/3/5/3/135339272/vafewu.pdfIn PDF document text
    • https://cdn.sqhk.co/nepasibuta/aiajhia/16261270612.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446151/normal_6017c68ea7a3d.pdfIn PDF document text
    • https://fobepomakiroka.weebly.com/uploads/1/3/0/8/130874330/5305983.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mukutud/pafito.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/pumegiteresoworekewag.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/baby_boy_pictures.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 5036 bytes
SHA-256: b7822980a41d2a6377596cf77bb8c1859e43da6252eb1e0ea3e3c5f08c0483da
font_01_sfnt_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 10436 bytes
SHA-256: c0b044f93c60e26d0993aab7fd3717f6bbf98bc69d1e31428bf9e6e2f400375a
font_02_sfnt_off00011b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B26 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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