Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7444680bb18a58…

MALICIOUS

PDF

74.6 KB Created: 2021-02-22 23:59:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 425e885dafa236ac6a24c30263a3443d SHA-1: b1112b45c72aaee498a9595d9c7dcdfed3e5e227 SHA-256: 6c7444680bb18a58843ff94a46ceee6f1ddeebb905bf23ad60ba493532eaca5a
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning model and ClamAV, as malicious. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The presence of external URIs and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

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://jacksth.ru/123?utm_term=que+significado+tiene+la+palabra+fu%25C3%25A9rzalos+a+entrar PDF link annotation
    • https://gejowarog.weebly.com/uploads/1/3/2/7/132740172/nevewu.pdfIn PDF document text
    • http://design-kvartira.info/lomukewenurulojecl3pw.pdfIn PDF document text
    • https://mevinabepoke.weebly.com/uploads/1/3/2/7/132740553/nerun-pilirovasa-tuwakal-milavum.pdfIn PDF document text
    • http://4d-5d.com/10269846998csycb.pdfIn PDF document text
    • http://lassituda.online/basic_english_conversation2nizk.pdfIn PDF document text
    • https://junobinedutuki.weebly.com/uploads/1/3/2/7/132712306/bofavubipaz.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/gSfWieZ/20080480538.pdfIn PDF document text
    • http://hydrofthol.space/vuguromejokamilexuvnbggg.pdfIn PDF document text
    • http://myyshooop224.site/why_were_the_new_england_colonies_startedn5p5b.pdfIn PDF document text
    • https://cdn.sqhk.co/daxegajok/Grla1hb/73927271071.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/f542223f2.pdfIn PDF document text
    • http://bet-info.ru/ponazofekifuvuxedasofaxipzifvv.pdfIn PDF document text
    • https://cdn.sqhk.co/xifusajexom/diilihy/53340925806.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zukovijaxi.epizy.com/28307481304.pdfIn PDF document text
    • http://xanatilaguweve.epizy.com/lopaterisimigukotitojes.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_off0000e208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE208 5716 bytes
SHA-256: 028a15dcd95e051cef99f399f2e9d8fe497f533ab87bdfb5c89bf1ed7c563cde
font_01_sfnt_off0000f550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 11380 bytes
SHA-256: 8c9ef0466e1848629b06f40d5b9bac101763abaa8563a6cd1270ef654bd3ab40

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