Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ce02393fc5f8bd…

MALICIOUS

PDF

71.7 KB Created: 2021-03-27 13:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 821c4ba325f337a4220c360f5f38a061 SHA-1: bac5a200465c1a90a6416b1506c289eaf7c28c85 SHA-256: 05ce02393fc5f8bdd3c056b470ff82191a7529711b4bcb2694855b6c86303993
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The file contains a large number of external links, suggesting a link farm or phishing attempt, with one prominent URL being https://golowaki.ru/award?keyword=air+insulated+switchgear+pdf. Although no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/award?keyword=air+insulated+switchgear+pdf
    • https://cdn.sqhk.co/rogevuzazi/BDRjegc/67323839683.pdf
    • http://alternativeinfluencenetwork.net/jotubisodovivigu1p29e.pdf
    • https://cdn.sqhk.co/kivipemo/CBzRJjj/4831920716.pdf
    • https://cdn.sqhk.co/falugojafat/ggc6heP/gudujidapixaxapisufaxelav.pdf
    • https://cdn.sqhk.co/sigidezok/hdhjieO/faredugopejenuxivi.pdf
    • https://cdn.sqhk.co/sutazojawote/gghb6ib/hunters_and_props_funky_potato.pdf
    • http://cenderaoriginator.com/minecraft_castle_designs_step_by_stepk2lvf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_547b1a3f33464fbf828b99a85d7f62bd.pdf?index=true
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_59292ef0f6be4a9c89aa04cc1f90340d.pdf?index=true
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_f4e098038e33461da5028e42cc04911f.pdf?index=true
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_b6a9ea4533c9436cb9496bf17fe05a04.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dfd36c3d-1157-40f3-b4d7-f127cf1355af/britax_car_seat_forward_facing_installation.pdf
    • https://s3.amazonaws.com/wovisak/uitleg_achtergrondinformatie_synoniem.pdf
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_822c787bada548209bcb7fe194a41a4a.pdf?index=true
    • https://s3.amazonaws.com/jolituzoji/which_of_the_following_assets_are_amortized.pdf
    • https://uploads.strikinglycdn.com/files/14da5bf5-1e2c-403a-8286-3a4e23657008/how_to_access_my_cisco_dpc3825.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_off0000da74.bin
0c75500205cce9e2e35de5f86dab85ddace583ee040258c9af607f46802af873		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA74 5496 bytes
font_01_sfnt_off0000ed34.bin
602b033d0a87335768c6f4cdebb9f657fe6494cf32b242b93244ed7eba1f0f2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED34 10736 bytes

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