Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f21fed10a3e9eb…

MALICIOUS

PDF

71.5 KB Created: 2021-04-23 04:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7f3ac68bde6e948ad0606e641b0ddd5e SHA-1: 29178c721c57ace9f37c897be154deae426df45a SHA-256: a4f21fed10a3e9eb88fe0c51cbc50c583c03d3d965ff9f81f033351067140695
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/strik?utm_term=harry+potter+2021+wall+calendar+amazon PDF link annotation
    • https://notebatamigoxaw.weebly.com/uploads/1/3/4/7/134715817/dugoru.pdfIn PDF document text
    • https://cdn.sqhk.co/bubarozotuj/Hghhbja/jorowigivixoxozilimuta.pdfIn PDF document text
    • https://cdn.sqhk.co/xidosisew/gjieo7r/calculator_app_for_android_that_hides_pictures.pdfIn PDF document text
    • http://creamspait.xyz/7935419951q01yj.pdfIn PDF document text
    • https://butitonivo.weebly.com/uploads/1/3/4/3/134314214/9385567.pdfIn PDF document text
    • https://pigaxapi.weebly.com/uploads/1/3/2/8/132815084/1848919.pdfIn PDF document text
    • https://tilotifibow.weebly.com/uploads/1/3/4/5/134505855/e2e69689a1.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/fbgiijg/bloons_td_battles_mod_apk_android_1.pdfIn PDF document text
    • http://gosepakaf.getenjoyment.net/devudizedade.pdfIn PDF document text
    • http://tixanijematewe.mypressonline.com/77872026567.pdfIn PDF document text
    • https://cdn.sqhk.co/xiladuxe/HheQn77/11432262424.pdfIn PDF document text
    • https://cdn.sqhk.co/savaketiju/jggiigX/steel_pulse_true_democracy_blogspot_download.pdfIn PDF document text
    • http://nicechange.space/rent_agreement_format_in_marathillsui.pdfIn PDF document text
    • https://suzuxagutif.weebly.com/uploads/1/3/4/3/134352905/67a7b957.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/tifox.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/bioflix_activity_membrane_transport_active_transport_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/madelotoge.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_off0000d503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD503 5572 bytes
SHA-256: 59b46b862aa2574f8773a2ffbfc156f5b5d2bb7f227ebe8f530c9f49d92d4b31
font_01_sfnt_off0000e806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE806 11624 bytes
SHA-256: 5bcfb4ab6cb1eb0747ec9509f7f9901a1305f061b7c7ab7a1824c52f0a90809a

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