Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4bba8a1d8417b6…

MALICIOUS

PDF

85.2 KB Created: 2021-02-22 04:58:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 22ee76ef89b0fd907520e63ed6478577 SHA-1: 77571b0c7b31324a5a40be4d42db5dd50a93150b SHA-256: fb4bba8a1d8417b600c9d0ae08b2e3462acb7aa8025fb1c53457949463447c90
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and a link farm, a common tactic for phishing and malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malware. No scripts were extracted, but the PDF structure itself is indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/strik?utm_term=class+3rd+maths+book+ncert PDF link annotation
    • https://cdn.sqhk.co/mokevesin/xwhdjjI/fitedakutofanifufid.pdfIn PDF document text
    • http://all-casino.xyz/chocolate_2005_full_movie_480pzdrje.pdfIn PDF document text
    • https://cdn.sqhk.co/mozesefoso/VDjchgL/warning_flags_in_order.pdfIn PDF document text
    • https://cdn.sqhk.co/jekurona/cjdqkIe/cross_stitch_patterns_plastic_canvas.pdfIn PDF document text
    • http://tryici.xyz/98300180379t4pgh.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/hhbhbrk/37652976862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450247/normal_602897de10207.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386076/normal_5feb5959ab33d.pdfIn PDF document text
    • http://zoom-omsk.ru/ielts_academic_reading_practice_test_with_answers_201713w6x.pdfIn PDF document text
    • http://freshka.fun/263974600850obcf.pdfIn PDF document text
    • https://badakawage.weebly.com/uploads/1/3/0/9/130969543/cd434ab3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385437/normal_5fcf3d9837b92.pdfIn PDF document text
    • http://busibear.com/vugulofiwimogorunowobabenbrir.pdfIn PDF document text
    • http://bluebadgeapproval.com/garment_costing_sheet_excel5y2h8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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_off0000ee6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 5452 bytes
SHA-256: 6f74190432965f3db9aa229251245dea5054f26a95ea19d5a836f9ee04571e20
font_01_sfnt_off000100c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 10692 bytes
SHA-256: a6b8955e59e7f1d80452fa20cb4dabb2a875f35312e8f6233e0cee97f390fef5
font_02_sfnt_off00012573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12573 16132 bytes
SHA-256: 6820151f9a4816bccc9e85e605aef44ce22c8924dfcccd161584754f275bf028
font_03_sfnt_off00013aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA6 3052 bytes
SHA-256: d21ffa6fac787b50dbd63d4ea304b8cfb86de3c85e290f9a49f1a0059612843d

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