Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc378a05a4817806…

MALICIOUS

PDF

78.3 KB Created: 2021-05-12 19:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65b34efca626479efd5314fda6f3aa2e SHA-1: 96971e581c532631c8759bb4c5934d8daef64cd2 SHA-256: fc378a05a4817806f119795ccd95424222c2b37560bab236168ea1c4aa22325a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to suspicious domains, indicating a link farm or phishing lure. ClamAV and ML classifiers identified the PDF as malicious, specifically a phishing trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=reduction+printmaking+lesson+plan
    • https://gepogixuzusesil.weebly.com/uploads/1/3/3/9/133999736/8379796.pdf
    • https://vibofizetukoz.weebly.com/uploads/1/3/0/9/130969748/zilewur-bigeluwatedub.pdf
    • http://pro-komp-master.website/30957974979bb1wo.pdf
    • https://nofemifi.weebly.com/uploads/1/3/2/7/132710694/ninoroperem.pdf
    • http://blablablacar.online/2015_volkswagen_passat_owners_manualifp7j.pdf
    • http://hisgohar.site/best_vr_games_for_ps4_2019zluli.pdf
    • https://bepixumute.weebly.com/uploads/1/3/5/3/135302933/pevisujujaz_nagexazo_digemet_juwera.pdf
    • https://nuwuzeparagagux.weebly.com/uploads/1/3/4/8/134883197/9992f5e82.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ca63f3e9-588f-4791-abd8-ccc83490b2a0/87376999297.pdf
    • https://s3.amazonaws.com/gotitibekovi/bhu_bsc_agriculture_form_2019_date.pdf
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_d66f53e429234d4bade4a21a55d60bc1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f3863a8b-513c-4cef-a339-7d6c0ac87d75/sports_management_in_physical_education.pdf
    • https://uploads.strikinglycdn.com/files/87b1c09d-0230-46d6-97bc-de9c149527b4/40149980636.pdf
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_a4f2278a0c264d42855cf5341e179420.pdf?index=true
    • https://64e1471b-64f8-4582-b127-b1692805dd1b.filesusr.com/ugd/507a3d_9f2437c70f9341628372053195f7232b.pdf?index=true
    • https://s3.amazonaws.com/jolozidabi/94451691515.pdf
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_7598cdf1199845a6b87b0c5ec6b6896a.pdf?index=true
    • https://748e62c5-a849-4dff-87e7-3b5f74cb3522.filesusr.com/ugd/0df896_ef829205de0b465fb5c48cd779475ce6.pdf?index=true
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_a54007c1e857423d9d54ec65d1c20a35.pdf?index=true
    • https://uploads.strikinglycdn.com/files/06da1fc9-3efe-4318-b2ad-e1d9c5e656d7/how_much_time_do_you_get_for_a_third_degree_felony.pdf
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_384b5fd6fed6411498673e1ec68c19c4.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_off0000f5c9.bin
3d9807181de5f944c03482a780b79653301ff300374c932603cd5221ac2ee540		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C9 5464 bytes
font_01_sfnt_off00010851.bin
b8e48172e18895cb231f7cb25ebe8868831de2815bdb441ded7eed495756f5ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10851 10388 bytes

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