Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ecb64c0605e2030…

MALICIOUS

PDF

79.6 KB Created: 2021-03-19 23:33:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d5f2d51f0422e2bfd09b6d15e0529e7 SHA-1: 7508e1091a9ca58bfcf386584cdfe19583c4c552 SHA-256: 0ecb64c0605e2030c79a78917eec6b49be1bf1ab734bea29912b68528b810902
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for an external URI, pointing to a URL that appears to be a lure for downloading drivers. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, contains text related to 'Dell inspiron n5010 drivers free download', reinforcing the phishing pretext. No scripts were extracted, but the presence of an external URI in a malicious PDF suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://druttle.ru/strik?utm_term=dell+inspiron+n5010+drivers+free+download
    • http://save50it.pro/bamboo_sheets_bed_bath_and_beyonddogvx.pdf
    • http://moscow-siberian-force.online/what_does_black_boy_joy_meanmdrjv.pdf
    • http://apparentlyopt.com/25643733094zld4n.pdf
    • https://cdn-cms.f-static.net/uploads/4481671/normal_6039eb6030344.pdf
    • https://cdn-cms.f-static.net/uploads/4384028/normal_6013231472d6e.pdf
    • http://belkwigs.com/42395995786uog49.pdf
    • http://sbrf.link/nefuvuxonudapamonegomv5lew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/84f6c842-5ad3-4662-b91e-0d051e075ec9/briggs_and_stratton_625ex_150cc_oil_change.pdf
    • https://s3.amazonaws.com/gelawiweza/74561487037.pdf
    • https://uploads.strikinglycdn.com/files/7d05222a-7fb5-4f4d-92f9-a69294e5d234/jewivagajepokud.pdf
    • https://uploads.strikinglycdn.com/files/a4e87a5e-d042-4d66-a60a-7d154ea94ae4/gememopiwixebuvofile.pdf
    • https://uploads.strikinglycdn.com/files/c0cb33ca-4de9-428a-bf0c-a0134e4b3ef8/montgomery_county_texas_sales_tax_rate_2019.pdf
    • https://s3.amazonaws.com/rebesudanolo/7982291153.pdf
    • https://uploads.strikinglycdn.com/files/68932c37-1365-4aca-aae8-3faa0ccc6736/mackie_mix8_vs_behringer_802.pdf
    • https://uploads.strikinglycdn.com/files/7a0fa5cb-9a67-42c3-a974-6ac6aa3b1a68/experience_and_education_john_dewey_summary.pdf
    • https://uploads.strikinglycdn.com/files/d00c494c-30bc-4463-8341-7d60285a357a/53080317547.pdf
    • https://uploads.strikinglycdn.com/files/69f834ec-e722-4f73-8846-f6f3569c2c53/64836754291.pdf
    • https://s3.amazonaws.com/zexozavo/8005192427.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece4.bin
79179b8e74cf1f4ba49493df3b90427d93f2ec2d9fc6a2194e3b1d1b7cc91681		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 5212 bytes
font_01_sfnt_off0000fec7.bin
6f10d30edab152dbfcd8461125a1f0d316df47596816c925ec764a2c0bdf521f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC7 10584 bytes
font_02_sfnt_off000122ff.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122FF 4324 bytes

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