Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34f4a0127b9a315…

MALICIOUS

PDF

98.0 KB Created: 2021-03-24 05:13:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85950a12558fcdf01c683c8d8c76bdab SHA-1: 51d6626913106bdb86f861bb43814ff50e013861 SHA-256: f34f4a0127b9a315543ccd86901faea6cbca50ba6a0bdb4f50209bbbbfcab0ac
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 of which point to other PDF files, suggesting an SEO link farm or spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=organigramas+de+empresas+comerciales+industriales+y+de+servicios
    • https://cdn-cms.f-static.net/uploads/4388426/normal_600dd95b3feda.pdf
    • https://cdn.sqhk.co/wepunajexiju/aYdyIFr/thc_infused_apple_pie.pdf
    • http://figuxovutofid.mygamesonline.org/zuzalizilosatubisutete.pdf
    • https://patoduwewoz.weebly.com/uploads/1/3/1/4/131483118/6570960.pdf
    • https://vulakesekek.weebly.com/uploads/1/3/1/4/131438428/zurin.pdf
    • https://cdn.sqhk.co/fatepotax/ii5Njhr/lizexelivobodeto.pdf
    • https://cdn.sqhk.co/jekunesoru/dOL6fxD/lewoxixowarubenatin.pdf
    • https://static.s123-cdn-static.com/uploads/4471464/normal_5fee490da1eca.pdf
    • https://cdn.sqhk.co/mitajaso/ihgfgfH/nafapovuw.pdf
    • https://cdn-cms.f-static.net/uploads/4390385/normal_60184e73267f4.pdf
    • https://cdn.sqhk.co/vofepubot/lgihdAT/auto_views_instagram_free_apk.pdf
    • https://cdn.sqhk.co/letarezetap/CtjdgtM/fast_money_halftime_report_cnbc_fix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://49884795-3b66-401c-adaf-b59e999553af.filesusr.com/ugd/8bd6c9_6988b590d6174049937caa0b2716ef53.pdf?index=true
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_93f9fa8d61f44ab98c1ae07612bced89.pdf?index=true
    • http://rosajeku.myartsonline.com/xugiwusafogozuz.pdf
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_8aeb6a67eca54bf58378c315daeb3351.pdf?index=true
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_e2c0dc08db19425d919c18479fe93b4e.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f71.bin
127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F71 6744 bytes
font_01_sfnt_off00013058.bin
faa0476fcb9a085ec088faff7eef3df6c69f12951499f036ebcb0ffdbe431d83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13058 5464 bytes
font_02_sfnt_off000142d5.bin
fc8f18398ace663d6f2c12f6145696d618cd77c97fe9efad1047ad94ceafa943		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142D5 11960 bytes
font_03_sfnt_off00016972.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16972 4324 bytes

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