Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88a9c5d5fed750f…

MALICIOUS

PDF

72.3 KB Created: 2021-03-06 01:59:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dec97aeea6c115810f3c15b0bcd0fd4b SHA-1: bb49f18daf915b83a74be2062f85a2c489b25689 SHA-256: f88a9c5d5fed750f23c91409c280f13edc6ed2868ef3dd2748e21ca53c2cfe62
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a malformed exploit stream, indicating malicious intent. It also features a URI pointing to 'xezojetit.ru' with a 'brandy melville free shipping' keyword, suggesting a phishing or scam lure. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xezojetit.ru/award?keyword=brandy+melville+free+shipping PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412900/normal_603956136d593.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529780/normal_602de3370c884.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473890/normal_603137ed12aac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479433/normal_5fc991a17a62a.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/f6bc7aaa-a451-4c3b-be81-4a255d6a76e2/bowflex_treadclimber_tc10_used_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/45764102846.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/62433847648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d290a937-a444-4b28-95a6-9179ce88d53b/troy_bilt_tb110_blade_bolt_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ab2c3a9-6ffa-42ad-b322-4c80d6df86c3/how_to_snap_together_a_snuggle_blanket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21879b70-8476-4143-a355-0bb3d0246a9f/how_to_use_japanese_pocket_warmer.pdfIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_99f7889dbc3a43678330cd611a993281.pdf?index=trueIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_af012ee4caf4419382d2eb2b600ccd1e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/ios_6_ipad_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/586cdb0e-e279-4c27-b2e2-7b93ae7b6568/redib.pdfIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_58f14619a29848448388ae7a43cb4fe7.pdf?index=trueIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_b92315b3aa3d48478797c0dff46be596.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/32bc5ddf-80ac-47cc-9366-694f43309695/google_search_by_photo_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df99ef1-16fe-44af-b662-400dd8b2e37f/jonexujafovozoxomani.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_off0000dc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4C 5668 bytes
SHA-256: 66a8d4a64b0e521a7743583c57f8e53e90776fdb8c67c104990cfef794fd1dd9
font_01_sfnt_off0000ef7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 10608 bytes
SHA-256: baf16fe8fea5db49f6d806120599c97e23ae6840f78d86c1ebac7f91526d8fb9