Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4ef5f834b60c45…

MALICIOUS

PDF

75.5 KB Created: 2021-02-22 06:56:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ac3100c90a89c2130247a3e67e7fe7f4 SHA-1: ea00617b228661f53a73d0c4f89b385d012296be SHA-256: 4d4ef5f834b60c45d9c0a1f9ef4f40d172b7f3c034248835e55d72572b88914e
134 Risk Score

Malware Insights

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

The PDF document contains multiple external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous PDF links, suggesting a coordinated effort to distribute malicious content. Although no scripts were extracted, the presence of external links and the overall detection profile strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=how+to+animate+using+ipad+pro PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449187/normal_5ffcfb6f45ab5.pdfIn PDF document text
    • http://gitipakivo.iblogger.org/adventure_quest_worlds_hack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393790/normal_5fd78c5058e2e.pdfIn PDF document text
    • https://woduluzotuni.weebly.com/uploads/1/3/4/3/134373450/potoviz.pdfIn PDF document text
    • https://mevinabepoke.weebly.com/uploads/1/3/2/7/132740553/zosozuta.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/fghgegc/traduccion_que_tengas_en_italiano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501775/normal_5fdcb26483235.pdfIn PDF document text
    • https://cdn.sqhk.co/kosifodalab/vgggjgg/deal_finder_cape_girardeau_missouri.pdfIn PDF document text
    • https://gilurumujeluzem.weebly.com/uploads/1/3/1/8/131857598/63f73c66.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedajoze/iGia03O/vujebugixuvabesodimafator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382793/normal_5fd37831d90f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pexefenebize.epizy.com/5944208234.pdfIn PDF document text
    • http://xilutetixu.epizy.com/37695748212.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_off0000e0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F4 5300 bytes
SHA-256: 58b7c19384d5ee29869a1d3c675bc37a33bb82ca02d820c98d470941d0ff6940
font_01_sfnt_off0000f2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F1 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000fb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 11044 bytes
SHA-256: ae84af7e1d80ee728f4988d0bba053912eeccd6fe06849cf8405541210bedc56

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