Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95c59d979db7a0c…

MALICIOUS

PDF

73.2 KB Created: 2021-02-14 05:46:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7c1916aed2a4a59a3572beca05710e64 SHA-1: cb01c4fd6f1585b41a0b4f2da566ce27293b4610 SHA-256: b95c59d979db7a0c1778c0cce4f10bd1b860c7461501a3fd45263211a86ef6a9
134 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with a primary focus on a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a social engineering attack to trick users into downloading or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://baarspo.ru/wix?keyword=movie+box+vshare+ios+10 PDF link annotation
    • https://mezemefi.weebly.com/uploads/1/3/1/3/131384279/ef926f1d.pdfIn PDF document text
    • https://fidimamafiw.weebly.com/uploads/1/3/4/6/134624465/7840014.pdfIn PDF document text
    • http://fastdonwload.space/avengers_endgame_legends_toyslizg5.pdfIn PDF document text
    • https://cdn.sqhk.co/baresupujar/hagchjV/icebreaker_a_viking_voyage_unblocked.pdfIn PDF document text
    • https://jajadonafusava.weebly.com/uploads/1/3/4/0/134040597/8173602.pdfIn PDF document text
    • https://cdn.sqhk.co/puzokopu/9bzihhd/candy_grabber_hand.pdfIn PDF document text
    • https://nisaxiguxizi.weebly.com/uploads/1/3/5/3/135306566/mewitoleno_mirogotuw_tudelutawale_ditojajolagi.pdfIn PDF document text
    • https://sitakubijilu.weebly.com/uploads/1/3/0/7/130776110/7023152.pdfIn PDF document text
    • http://mosaniz.22web.org/best_hd_wallpaper_site.pdfIn PDF document text
    • https://cdn.sqhk.co/konafomaz/haviaTo/the_earth_nowadays_essay.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/potamotaz/16576000260.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/pen_pal_letter_template_spanish.pdfIn PDF document text
    • http://topadut.epizy.com/fxos_command_line_reference_guide.pdfIn PDF document text
    • http://jotinonikudodi.rf.gd/format_code_android_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/74078129571.pdfIn PDF document text
    • http://vitupofelomar.epizy.com/tubemate_cracked_apk.pdfIn PDF document text
    • http://pulawev.epizy.com/cyanogenmod_cm11_cm12.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_off0000e2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B4 5208 bytes
SHA-256: 13d38e6b0e186c755d8f3c8dbbdcd6ff5cceac202af5b8db3d86854fc0ff9b05
font_01_sfnt_off0000f477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF477 10248 bytes
SHA-256: 6185f2a29bb33a50c725cbcf0e21c1f1d10d563bdf704a59dd54dde846bc59ac

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