Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd39e36161363624…

MALICIOUS

PDF

85.9 KB Created: 2021-04-09 05:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b3e99f18310a5afee2f6ef6a96caa493 SHA-1: 235c0b6717789d1e20f429aa7d7803d30bb5894b SHA-256: fd39e3616136362487d7a9c10a0ca5a2856a3a76bab331c4bfbda1d8d6a89425
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and one specifically flagged as a link farm. ClamAV and ML classifiers identified this PDF as malicious, likely phishing-related. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect users 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://fokemale.ru/strik?utm_term=4+quart+crock+pot+breakfast+recipes PDF link annotation
    • http://sutobep.getenjoyment.net/aditivos_alimentarios_cancerigenos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483856/normal_603d56b819ca3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490725/normal_60485587152ff.pdfIn PDF document text
    • https://dowozazufexu.weebly.com/uploads/1/3/4/6/134606261/7353126.pdfIn PDF document text
    • http://barberking.best/26831793993oj6js.pdfIn PDF document text
    • https://mevukufidax.weebly.com/uploads/1/3/1/3/131379039/fevagomiv.pdfIn PDF document text
    • http://mignonette.space/wukamuguwetofotq2nz.pdfIn PDF document text
    • https://luzuredero.weebly.com/uploads/1/3/4/0/134016924/xewetede.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403415/normal_5fd6eab17275a.pdfIn PDF document text
    • http://sutarakikim.scienceontheweb.net/pakawu.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/b9685a54-f82f-44bf-a3e2-e28475f4c0c0/riwujuwetetesukijoti.pdfIn PDF document text
    • http://mopituvozu.epizy.com/63687542407.pdfIn PDF document text
    • http://jutepopoladajol.epizy.com/cours_atomistique_et_liaison_chimique.pdfIn PDF document text
    • http://somifisuvukibuk.onlinewebshop.net/distinguish_between_language_acquisition_and_language_learning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc44dbca-129b-4476-b21b-2fae2a3a3d3d/vowonepelobulapakide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d172ff63-05a9-486e-83f9-c885057b204f/helter_skelter_meaning_song.pdfIn PDF document text
    • http://fezefujeziged.epizy.com/aliments_riches_en_omega_3.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_off0001103f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103F 5300 bytes
SHA-256: 8a4208b5c77d1b14a1e214941716babdd42c97acf9696305f5d8c4e5748f7f8c
font_01_sfnt_off0001225b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225B 11376 bytes
SHA-256: e0cde77d5b40b72dcde20938650c1a54fa736d871dd22bb5a845fa12e066d31f

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