Malicious PDF — malware analysis report

Static analysis result for SHA-256 75dd4d369622c913…

MALICIOUS

PDF

79.0 KB Created: 2021-03-14 15:51:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 21287e685065af813872ad4c58d6d53a SHA-1: 1d70da6c0bd7852c73ee3d9e74a973f25eb8caa4 SHA-256: 75dd4d369622c91303797775969f329b05afb36ae65dc4c7012c7303c78a4cd0
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with one prominent URL suggesting a lure related to a 'rental bond disposal form'. The presence of multiple disposable hosting domains and link farm characteristics further indicates malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://kuzutuzo.ru/123?utm_term=rental+bond+disposal+form+wa PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4502870/normal_5fc68cfb1a811.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389801/normal_5ffce548c0979.pdfIn PDF document text
    • http://pomirkapa.site/inspiron_3847_graphics_cardl9s55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_5fdaac7785526.pdfIn PDF document text
    • http://kuworekokinig.medianewsonline.com/xusuvizosuwaxiladobof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454180/normal_5fdb67f39551a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453560/normal_5fe3c70ca76df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449627/normal_602456b9a0e8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427820/normal_6035be49db748.pdfIn PDF document text
    • http://digtalcaliper09.xyz/altec_lansing_mini_lifejacket_battery_replacementr2hsv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412161/normal_604de553c08e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kudetewususitup.rf.gd/20936839103.pdfIn PDF document text
    • http://pojozija.onlinewebshop.net/q-see_qt_view_pc_download.pdfIn PDF document text
    • http://sejibuka.epizy.com/excel_weekday_from_date_format.pdfIn PDF document text
    • http://posidepixofonep.epizy.com/ceclor_bd_750.pdfIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_de9ca0a8c9034d65b22ce4d35a3acaec.pdf?index=trueIn PDF document text
    • http://kebenubes.onlinewebshop.net/32124965000.pdfIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_63cd62981e12448fa67e8a81a8fc287f.pdf?index=trueIn 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_off0000f797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 5428 bytes
SHA-256: 66786dffea2a91bb87b6313b8e2075407ea8b633b8a4872e2be38ef995ae7768
font_01_sfnt_off00010a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A02 10872 bytes
SHA-256: 3bb39b6f97df4de8b354f502fb7aa23e7b8ea5bf991004035bba701997dfaea8

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