Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ed4f95e177f4a9…

MALICIOUS

PDF

87.2 KB Created: 2021-04-11 08:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 51202b39f7448c8f499be6d2a6c018fb SHA-1: 55e8195a3fa1de859b960155c0c1e017b0b7e390 SHA-256: e4ed4f95e177f4a9967c4f31deb849a080a515a91d627f9a52137b2d12852eb4
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs and the document body, which mentions 'grounding techniques for ptsd', suggest a phishing or malware distribution lure. No scripts were extracted, but the presence of numerous external links points to an attempt to redirect the user to malicious content.

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://jottigo.ru/strik?utm_term=grounding+techniques+for+ptsd PDF link annotation
    • http://sreda.city/state_stokes_theoremzeryx.pdfIn PDF document text
    • https://pimazapodozem.weebly.com/uploads/1/3/2/8/132814260/3111694.pdfIn PDF document text
    • http://heartcenteredequestrian.com/biduzonodvoy4.pdfIn PDF document text
    • http://revershjtb.site/bitcoin_for_dummies_freeyu5o7.pdfIn PDF document text
    • https://govasosu.weebly.com/uploads/1/3/4/5/134519533/dunoji.pdfIn PDF document text
    • https://cdn.sqhk.co/xapawavuma/Zhjih35/butterfly_wings_template.pdfIn PDF document text
    • http://nnorm-id.com/28186640198f1a1t.pdfIn PDF document text
    • http://sodaapp.pro/chrome_browser_free_for_macm71du.pdfIn PDF document text
    • http://wonder-ita.space/778104900955ajdx.pdfIn PDF document text
    • http://coupons2020.info/harlingen_weather_report8j5z4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379973/normal_60588e276b126.pdfIn PDF document text
    • http://kvrovk.xyz/peboboxiketi0ns38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405641/normal_602a92bdcdd0d.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/ktjjmij/rumble_racing_app_download_for_android.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://rasprodavaika.ru/vdot_flagger_certification_test_answersyu0oc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_604aed6d0443b.pdfIn PDF document text
    • https://cdn.sqhk.co/lakisitu/FPfijhe/kukodizijepuxito.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b768f18-67e4-45a8-8d23-b9954999146a/faxuvizivezewinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4bb7e0e-cce4-4f32-b142-883f274630f3/how_to_learn_arabic_online_for_free.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_off000116e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E7 5332 bytes
SHA-256: 860fdeee3238d51d8278387075a3f3b36c3438ca92a3eeb4f72f476ce07d6899
font_01_sfnt_off00012909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12909 10784 bytes
SHA-256: 7490214791e967e3e8b4122131078cb91c168213513ac9eccf505562e4ca5fc6

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