Malicious PDF — malware analysis report

Static analysis result for SHA-256 c258d271c1b9d3ab…

MALICIOUS

PDF

74.6 KB Created: 2021-03-29 01:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2fae20182fee9909461785a84e87d96 SHA-1: 543c1359dfa992d5599f1afc9e394d93a8fa8456 SHA-256: c258d271c1b9d3ab6cbc885af70b599cdc4bafb9a5975675b756ecad384daa21
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier assigned a high probability of maliciousness. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, potentially for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/wix?keyword=political+cartoonist+education+requirements
    • https://cdn-cms.f-static.net/uploads/4371025/normal_6022af037e493.pdf
    • https://cdn-cms.f-static.net/uploads/4366331/normal_6043be90d122e.pdf
    • http://activa-fb.com/lovapabigot0ag4r.pdf
    • http://esplus.pro/21289968997f7lfn.pdf
    • http://airet.space/stewart_essential_calculus_solutions0il14.pdf
    • https://static.s123-cdn-static.com/uploads/4453102/normal_5fcd5965d1da2.pdf
    • http://idealica-ufficialeitalia.website/abstract_for_osmosis_lab_report5sqjx.pdf
    • https://cdn-cms.f-static.net/uploads/4407991/normal_6050545badcd9.pdf
    • https://cdn-cms.f-static.net/uploads/4377928/normal_604188cb72ee0.pdf
    • https://static.s123-cdn-static.com/uploads/4380680/normal_5fdcd80965fad.pdf
    • http://copriyghtconfirmed.com/manukau_weather_report_tomorrow4o9yw.pdf
    • https://cdn-cms.f-static.net/uploads/4498893/normal_5fd0d3beb9e5f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d3da5f5d-92e3-4eb4-8f7a-13efa4dc8869/93549063930.pdf
    • https://uploads.strikinglycdn.com/files/6be9a330-c835-410b-a99f-767d4744945a/17793162100.pdf
    • https://uploads.strikinglycdn.com/files/e08c9ded-f480-4bc0-b8ab-04b3af3bfabb/cos_180-theta_value.pdf
    • https://uploads.strikinglycdn.com/files/76710ff9-7318-429d-8b55-800bf6dfc2d6/vodifofasinonekik.pdf
    • https://uploads.strikinglycdn.com/files/e838ba84-8759-4287-8451-bd3246ace7b6/tujakepojofazoledo.pdf
    • https://uploads.strikinglycdn.com/files/d0ffb9c8-cd30-47a0-aff2-f680a7466b76/jolipibawaf.pdf
    • https://uploads.strikinglycdn.com/files/ecd0f1f8-1676-4882-9d8a-4fdc041ae69a/how_much_does_it_cost_to_replace_engine_and_transmission_mounts.pdf
    • https://uploads.strikinglycdn.com/files/54d77bfc-885b-43f1-824a-15b00470dc20/43062359535.pdf
    • https://uploads.strikinglycdn.com/files/95d875e4-4b22-4950-8c0c-2d44e6d1b60a/13613197232.pdf
    • 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_off0000e58d.bin
1078b9b44b4a3e0dc36afcc7658adeb9c5554dad2ac40f5da7ce69c9125fb3d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE58D 5212 bytes
font_01_sfnt_off0000f72f.bin
e3323672d555a34dd782e6175135084319dc61b60596d3ee5d0860c0c289b24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 10544 bytes

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