Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a523b1c2865b00c…

MALICIOUS

PDF

77.7 KB Created: 2021-03-13 18:40:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 531feef40ff0df8df1b2d6e99ece5eb0 SHA-1: e0d0a1cd5629c1bedeff063d08261461ab848914 SHA-256: 5a523b1c2865b00c3b828f56b8293e3b7cf687a1929830d3324b06a50db2c2bf
164 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to other PDFs, suggesting a link farm for SEO manipulation or phishing. The presence of a 'download' button lure and ML classification strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/123?utm_term=whatsapp+stickers+pack+free
    • https://cdn.sqhk.co/datolabevev/cDfIQif/18359475339.pdf
    • https://cdn.sqhk.co/gizoxemovefi/fzijCsX/48272541848.pdf
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/netupisakez.pdf
    • http://xiletunekukine.iblogger.org/baseball_uniforms_team_packs.pdf
    • https://vibufimibe.weebly.com/uploads/1/3/0/7/130738819/bobitoviwaw_sirulurosow_potob.pdf
    • https://static.s123-cdn-static.com/uploads/4455898/normal_5ff1149f71f5b.pdf
    • https://cdn.sqhk.co/mopomotop/gRkghrf/35073621475.pdf
    • https://cdn.sqhk.co/wefonasifaza/Hdjj6o9/american_football_league.pdf
    • https://xisevulatunetu.weebly.com/uploads/1/3/4/5/134595014/490410bd632e9b.pdf
    • https://sewogasi.weebly.com/uploads/1/3/1/1/131163712/4531877.pdf
    • https://cdn-cms.f-static.net/uploads/4374021/normal_603515bd121f9.pdf
    • https://cdn-cms.f-static.net/uploads/4446264/normal_6014a13d996db.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sugosabogakeg.rf.gd/83781941547.pdf
    • http://jikeroti.epizy.com/ashcroft_b_series_pressure_switch.pdf
    • https://s3.amazonaws.com/nelizenejakarug/executive_summary_construction_project_report.pdf
    • http://wafazitowem.rf.gd/96911879289.pdf
    • https://s3.amazonaws.com/dosalapasenow/oxford_collocations_dictionary_for_students_of_english_free.pdf
    • https://s3.amazonaws.com/zuxime/wanadozunusox.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_off0000f28e.bin
1733f1367bc1b5b75e74ccc25e013c8e54f1ac684ffed41a71f96a7907e46d35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 5148 bytes
font_01_sfnt_off0001041c.bin
96f2305aa9ce4291f862ef697f4d313ed02d0b72f09bdd48c4def497d07fef49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 11328 bytes

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