Malicious PDF — malware analysis report

Static analysis result for SHA-256 67dd4da5dcc73c28…

MALICIOUS

PDF

78.1 KB Created: 2021-03-20 17:27:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 259210c5a087acb76c8f9f4453c67577 SHA-1: 591fb0673b85af57eedffbef30e175fe8dc77993 SHA-256: 67dd4da5dcc73c28c1dd482877beee7a8e74e93925a19c8473f929a836731be2
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The file is a PDF containing multiple external links, with one heuristic specifically identifying it as a "PDF link farm" and another as an "advance-fee scam lure". The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of embedded URLs and the document's structure suggest it's designed to trick users into visiting malicious sites, likely for phishing or financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://zajinet.ru/award?keyword=bonafide+application+pdf
    • https://cdn-cms.f-static.net/uploads/4373502/normal_602cfced3706a.pdf
    • https://cdn-cms.f-static.net/uploads/4458389/normal_60315cd9c8a81.pdf
    • http://raisinshub.club/12204473032xbemb.pdf
    • http://cetapp.xyz/232929919t6j5v.pdf
    • https://static.s123-cdn-static.com/uploads/4387590/normal_6003311349438.pdf
    • http://nekimul.22web.org/the_game_tv_show_season_4_episode_1.pdf
    • https://towedesufab.weebly.com/uploads/1/3/5/3/135392656/b0ef7d12ee3.pdf
    • http://emmetrix.net/what_is_quality_management_system_iso_90007zu67.pdf
    • https://cdn-cms.f-static.net/uploads/4471095/normal_6037f36adf160.pdf
    • https://dawofatodir.weebly.com/uploads/1/3/4/7/134756430/jilekani_vijonuzoxiwima_tokiwobeli.pdf
    • http://sunshop.pro/365420631265gpau.pdf
    • https://cdn-cms.f-static.net/uploads/4416665/normal_6034bf2e74e04.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mevedokepovi.epizy.com/gipiwisar.pdf
    • https://64b67c6e-fbbd-4787-add8-9ed3e274c95c.filesusr.com/ugd/eb6612_e6fa2025b82a477fb9680cf0cb452082.pdf?index=true
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_04b2ba99f09047d3be4257e08b25d137.pdf?index=true
    • https://5da1c7d8-01c4-4175-bbf8-c25915566394.filesusr.com/ugd/1084fb_65e85275fc8045158bc5dca1467c73f6.pdf?index=true
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_46c9bd9e4e084dc99efcad12fd4d33b5.pdf?index=true
    • https://ff999131-262c-4f46-aa1e-84c50d3d9e43.filesusr.com/ugd/a474dd_e92ea944a53d4022be1c58bf7d2df7ee.pdf?index=true
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_a0ff33719c514c28a25913fc4e67b387.pdf?index=true
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_0b1f190d3ed24caaa13d22b1416cc503.pdf?index=true
    • http://gikojutubosolu.epizy.com/keurig_2.0_parts_walmart.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_off0000f329.bin
38d458418bb05788cc137d0a3e3db221539fbb9c2643830d0e6a66f3583cda27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF329 4924 bytes
font_01_sfnt_off00010409.bin
99ee92caa3d0c38ba9f2f7390156276d0810cc0f2d32bbab0da5dbee23def5b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10409 11624 bytes

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