Malicious PDF — malware analysis report

Static analysis result for SHA-256 831446d08c77c0e6…

MALICIOUS

PDF

75.7 KB Created: 2021-04-09 10:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cd33cd32af2c4ad729e9dd743e8ac8be SHA-1: 76dfcd28d59e5ba010e9e06e97a1764f893aa00e SHA-256: 831446d08c77c0e6b532bd4c02b8c3f0bf5ce2b2bf36ca931dd6d2d5990f29f0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI pointing to a suspicious domain, which is likely used to redirect users to a malicious site. The PDF's structure and embedded URLs suggest it is part of a phishing campaign designed to trick users into visiting a compromised or malicious resource.

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://jumiwimov.ru/strik?utm_term=champs+classroom+management+printables PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369496/normal_5fff15270a871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5fd9f647c8256.pdfIn PDF document text
    • https://jenajurowob.weebly.com/uploads/1/3/1/4/131408252/felexevigowefasaj.pdfIn PDF document text
    • http://libopadu.scienceontheweb.net/5636781044.pdfIn PDF document text
    • http://tuzupibu.scienceontheweb.net/dufusezusiv.pdfIn PDF document text
    • https://cdn.sqhk.co/wevubuse/wijifjj/48523979269.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365998/normal_5fccaa3c5069f.pdfIn PDF document text
    • https://cdn.sqhk.co/nemizuxe/fov90xe/beyblade_burst_app_codes_god.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403685/normal_60606c2cf1521.pdfIn PDF document text
    • http://lalikexitaxixix.getenjoyment.net/bakozizowekixuniza.pdfIn PDF document text
    • http://wofurasosezisax.mywebcommunity.org/59880759944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_601f6211d3291.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456121/normal_5fc963db6899e.pdfIn PDF document text
    • https://fijitedutim.weebly.com/uploads/1/3/1/1/131164269/7863506.pdfIn PDF document text
    • https://cdn.sqhk.co/gulanuwe/jcziegg/storyblocks_free_trial_video.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccdad6eb-ed0d-4578-8e7c-01bfb33e5539/saxon_math_course_2_cumulative_test_10a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7442e289-751f-496d-ab82-949d7f258950/how_to_change_battery_in_sensi_thermostat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3684bfe3-9366-4b24-a8e6-08785b3415d4/samsung_tv_remote_programming_instructions.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_off0000ea52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA52 5392 bytes
SHA-256: 9039281804e56a2e1fa3e6d4ac84c5353f48462738761d72566e6ec923e048ac
font_01_sfnt_off0000fc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC72 10876 bytes
SHA-256: 34394229d8827b8dfb0993ca32c0717e70851268cf3a0c0f210a97341da4d249

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