Malicious PDF — malware analysis report

Static analysis result for SHA-256 77472634c2eb242b…

MALICIOUS

PDF

103.2 KB Created: 2021-02-17 07:52:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 0fd248f92417d4db2eefe76b790a6321 SHA-1: 727fe65c4031b639783263a0c8157dac58f988fc SHA-256: 77472634c2eb242bc7fb3c4aa30e4dd3d7c0fb5768f4d47e7736cd83537589ca
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting it's designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=fourier+integral+theorem PDF link annotation
    • https://mafaredoli.weebly.com/uploads/1/3/2/6/132695491/1656295.pdfIn PDF document text
    • https://fufaguda.weebly.com/uploads/1/3/0/7/130739251/759e38cd2bf8cce.pdfIn PDF document text
    • http://xiviwuk.iblogger.org/57736216429.pdfIn PDF document text
    • http://revafazamige.iblogger.org/c_d_a_ka_full_form.pdfIn PDF document text
    • https://cdn.sqhk.co/lisesemafo/ggCggex/fee_manager_fee_income_expense_management_approach.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369165/normal_5ff406af10a29.pdfIn PDF document text
    • https://nuvitofoje.weebly.com/uploads/1/3/4/6/134640236/1dd442be2d9a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409255/normal_5feed38c38b9f.pdfIn PDF document text
    • https://cdn.sqhk.co/mewivupa/gfjaijN/flightstats_app_price.pdfIn PDF document text
    • https://marikiwow.weebly.com/uploads/1/3/1/3/131379510/wajavabaj_webopewamadu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474734/normal_600ce523b4c1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473030/normal_5ff55f0baaf31.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mizotafadoroze.rf.gd/vadegesategetuzijaloson.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/simple_regression_analysis_example.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001386f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386F 4876 bytes
SHA-256: df3b3ccca44136f5fbe774be4690f35f4023d522bd7026a5e65451360f81dbb0
font_01_sfnt_off000148dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148DD 15524 bytes
SHA-256: da9efca6c721f4eb5516404e62baa0af92493134aae0227f6ebe9bf35a41bf3e
font_02_sfnt_off00017a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A8D 16224 bytes
SHA-256: b22443d1e210ed796277e84571d9bc21c78e805f0d2170cb3c0606431ccd1a1a

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