Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d88f36daf192c6…

MALICIOUS

PDF

78.0 KB Created: 2021-02-01 00:54:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1e5bba6b60dc4d142e3d08b2ec2d9f89 SHA-1: 55575bcb1aa727702c54f4c92558122a1aa93604 SHA-256: 10d88f36daf192c6829afe99381909d23beb32f9a8f7a78589af1e9f0dc96b35
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one specifically targeting 'ipad guided access password' and leading to a suspicious domain. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, and the ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://jottigo.ru/123?utm_term=ipad+guided+access+password PDF link annotation
    • https://pabimoju.weebly.com/uploads/1/3/3/9/133997489/417db.pdfIn PDF document text
    • https://cdn.sqhk.co/salenasova/T7hhaja/muxijomuzijep.pdfIn PDF document text
    • https://mugebixivezir.weebly.com/uploads/1/3/1/4/131484268/0083b86d04f7bc.pdfIn PDF document text
    • https://revasarubon.weebly.com/uploads/1/3/5/2/135295272/b34ed43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488100/normal_5fffb41767400.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/cdgEBij/887439970.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/ggidxhe/rogibibimesewomejo.pdfIn PDF document text
    • https://fedifugakebijir.weebly.com/uploads/1/3/2/6/132695471/xikakujur.pdfIn PDF document text
    • https://cdn.sqhk.co/daposofoxig/Mvvhfgh/47072636734.pdfIn PDF document text
    • https://gidorimafemona.weebly.com/uploads/1/3/4/8/134867851/f329dd9855.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/pilazi/fugue_in_g_minor_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/linux_cannot_format_micro_sd_card.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/diagonalization_of_matrix_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/jesagidekuxufobokudale.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57F 5240 bytes
SHA-256: 81961bb50e99cece079592ff9638d615fd6a870b0931cee896dff564de05330a
font_01_sfnt_off0000e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE776 17444 bytes
SHA-256: 367d72e159c4322a7e9e7bdac436383135fe4d4a93096d3b9feb956629f6d930
font_02_sfnt_off000115ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AE 16312 bytes
SHA-256: bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939

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