Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f21ec869fea66d…

MALICIOUS

PDF

81.0 KB Created: 2021-02-14 07:11:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 479d07f751af4a436c056eff319a21e4 SHA-1: 295edd80963e7ace2d18b8393d1f6bf77e6dbd57 SHA-256: a3f21ec869fea66d1d10706992d1aa9d2611311d80402dc63189cca88b9f87c7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the ML classifier output strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://bologen.ru/123?utm_term=jennifer+lopez+fitted+sheets PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4428052/normal_5fdf0fec0da21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388428/normal_600140562f15d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489976/normal_5fe23912dfc92.pdfIn PDF document text
    • https://xujuwoxevosu.weebly.com/uploads/1/3/4/8/134896670/javewipaz-fugalebakasav.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/hheoTge/36738684070.pdfIn PDF document text
    • https://rasozonikazip.weebly.com/uploads/1/3/4/9/134904665/2235302.pdfIn PDF document text
    • https://bobidowi.weebly.com/uploads/1/3/2/7/132740787/afc29c25f5042d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462980/normal_5feb814226019.pdfIn PDF document text
    • https://demavagof.weebly.com/uploads/1/3/4/0/134017100/gexedokivovefi-xetonujijaxowik-vidusetojuwo-jovovedogu.pdfIn PDF document text
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/baxatizimopizomil.pdfIn PDF document text
    • https://cdn.sqhk.co/geruxibab/KyIDsjd/synchrony_bank_rooms_to_go.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/16207474549.pdfIn PDF document text
    • http://guduxakif.rf.gd/emulator_nes_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/collections_grade_7.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/rpg_maker_vx_ace_able_content.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 4960 bytes
SHA-256: 1c2a16d722110acfa43374795335c77883f8d4b055ebf6ac49a54ea0afd57dd2
font_01_sfnt_off0000eded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 5012 bytes
SHA-256: 2be9ea99c8c5211d45fef1ce29679b0a36fc57f59ee87f48ec881a23668614df
font_02_sfnt_off0000fb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9B 10656 bytes
SHA-256: a4f42661843d000756ec3df722bdb9849753498803eabc67b0b81825659115f5
font_03_sfnt_off00012057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12057 16312 bytes
SHA-256: bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939

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