Malicious PDF — malware analysis report

Static analysis result for SHA-256 81444390afb602c4…

MALICIOUS

PDF

76.8 KB Created: 2021-03-15 09:14:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c23e746bb4070b36b3227408405ec84 SHA-1: 1459cfade4036f7fda516ca64b2637cd87138fbb SHA-256: 81444390afb602c41cc20f09d70b9b2fb58731185a67ed35676a037dc3f7efe4
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external URIs and is structured as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the overall structure point towards a phishing or scam attempt, likely using a lure related to educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/wix?keyword=modern+elementary+statistics+12th+edition+answers
    • https://cdn.sqhk.co/numavagoko/gjfiLjd/36028876133.pdf
    • https://static.s123-cdn-static.com/uploads/4404293/normal_600262d8a8a31.pdf
    • https://sojetupeduxagi.weebly.com/uploads/1/3/1/8/131856567/fb212.pdf
    • https://static.s123-cdn-static.com/uploads/4423752/normal_5fdcc327a9d6d.pdf
    • https://cdn-cms.f-static.net/uploads/4489983/normal_60257c276bb7d.pdf
    • https://cdn.sqhk.co/zubuwebofe/xchcdzV/pepizemidusedimaforo.pdf
    • https://cdn.sqhk.co/vinasujitupe/jeieBGZ/nenirixejot.pdf
    • https://static.s123-cdn-static.com/uploads/4422890/normal_5ff0340963264.pdf
    • https://static.s123-cdn-static.com/uploads/4374532/normal_60091e6499491.pdf
    • https://cdn-cms.f-static.net/uploads/4377647/normal_603920c1ba66f.pdf
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/5353724.pdf
    • https://cdn.sqhk.co/lagitesavap/IujbhhV/four_pass_loop_colorado_facebook.pdf
    • https://cdn-cms.f-static.net/uploads/4422876/normal_600d11583b2f2.pdf
    • https://cdn.sqhk.co/daposofoxig/Oiihghe/how_we_draw_ice_cream_cone.pdf
    • https://rokojilezel.weebly.com/uploads/1/3/2/3/132302907/7509447.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/020a7d0e-5156-4d25-a170-72a72cf59f5f/xuwirujewesovanegizibiw.pdf
    • https://uploads.strikinglycdn.com/files/79fd3f95-c71e-4207-9923-299530f4bb64/wupolokiwezoj.pdf
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_03422f30a49e434abd815c547a5fad1f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/91841e25-9587-45b2-b1f4-05c0dc2ca6f7/misal_romano_latin_espaol_1962.pdf
    • https://uploads.strikinglycdn.com/files/0631299d-b95d-454d-851c-56c00a3b9931/15206229093.pdf
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_40dbf8a36ceb497c96c2b6a9d3312048.pdf?index=true
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_bde93ee215c64777b4f85edd0e6fc073.pdf?index=true
    • https://uploads.strikinglycdn.com/files/201f8bf0-922f-4de7-bf4d-ae857ae2bd22/why_does_my_dryer_not_dry_very_well.pdf
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_3b5d51c2942a4ccba091ecfe50506275.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea17.bin
a643e0dea84071d58d66323ec3951033e071fc9822e5bd5882b689a432647743		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA17 5564 bytes
font_01_sfnt_off0000fcfb.bin
6403380b9b4902fc71a00e926ce157c4b7afd47f37b4af1be913c43e814a4595		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFB 11232 bytes

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