Malicious PDF — malware analysis report

Static analysis result for SHA-256 502e43302a37684b…

MALICIOUS

PDF

75.3 KB Created: 2021-02-21 22:38:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: b198ef66630649fe578bbd0009ce6da1 SHA-1: 3cb4c3e373e7a72fd6926e9fd58d2acbd0e273e5 SHA-256: 502e43302a37684b48f802c82c4362ad24037611e08806c081068fc1cb6d91dc
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous external links, with several pointing to disposable hosting and link farms, suggesting an attempt to manipulate search engine results or distribute further malicious content. The PDF structure itself is also noted as a link farm, reinforcing the malicious intent.

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/wix?keyword=world+history+and+geography+1+sol+study+guide PDF link annotation
    • https://pejifote.weebly.com/uploads/1/3/5/3/135348690/kimegevesipu-razugusul-rikejarimipuk.pdfIn PDF document text
    • https://cdn.sqhk.co/kegetaxob/5xDrpgj/naxakibazepevitebopenu.pdfIn PDF document text
    • https://pagazamis.weebly.com/uploads/1/3/5/3/135310118/8322298.pdfIn PDF document text
    • https://pibefugaradaxo.weebly.com/uploads/1/3/1/3/131398186/5414935.pdfIn PDF document text
    • http://vewigufirenaw.22web.org/pesuvor.pdfIn PDF document text
    • https://xoxawipexari.weebly.com/uploads/1/3/0/7/130775732/koxexekogamo-dezikanepumo-selavo-dawetozijemilo.pdfIn PDF document text
    • https://zeruwowigewal.weebly.com/uploads/1/3/0/8/130813736/6223867.pdfIn PDF document text
    • https://cdn.sqhk.co/gasupewu/HgOhjgd/16417282384.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/zexope-dewufipidezix-kebaxomot.pdfIn PDF document text
    • https://tuvajidemagik.weebly.com/uploads/1/3/2/6/132681445/61f6bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424349/normal_600a4144eca4d.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/wulotugadag/peniwuwarebujibonuje.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/uc_browser_for_desktop_pc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/black_tail_cribo_care_sheet.pdfIn PDF document text
    • http://sojoramuf.epizy.com/ziwipef.pdfIn PDF document text
    • http://xosumuzav.epizy.com/50439802501.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_off0000e8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D1 5388 bytes
SHA-256: 6f6db6777e8e517c588f4a38fb5c3c2c16596cfc4487fcc14f871e72ced27a3b
font_01_sfnt_off0000fb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB35 11064 bytes
SHA-256: 9e0dc8fa3795117b29f4bd0d0d4140d4bd06df2809b36240734ffcec8dfdc0c4

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