Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ed780cce55417c…

MALICIOUS

PDF

69.7 KB Created: 2021-02-15 00:44:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 148b7741f799fb0a963470a738ec7ebf SHA-1: c9487ee7a9a17e2c52f1d0489b3c590f930c70f5 SHA-256: c7ed780cce55417ce304076eb43250c7a2237cc372c404a3ef603bcbcba53315
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains references to 'Chico state bookstore job' and 'wkhtmltopdf', indicating a potential lure for job seekers. The presence of embedded JavaScript, though not explicitly detailed in the provided heuristics, is a common method for executing malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/123?utm_term=chico+state+bookstore+job PDF link annotation
    • https://zobagitolofoxaz.weebly.com/uploads/1/3/0/7/130739917/5876694.pdfIn PDF document text
    • http://tubunasozejut.22web.org/cs_go_android_online.pdfIn PDF document text
    • http://depupejaxidolip.22web.org/capsulitis_adhesiva_causas.pdfIn PDF document text
    • https://xavexipaw.weebly.com/uploads/1/3/1/6/131636683/nonodiwuxinasig.pdfIn PDF document text
    • https://cdn.sqhk.co/mojafefegamo/jdZKh1x/60239312638.pdfIn PDF document text
    • https://cdn.sqhk.co/vizebika/ichhaK3/1290364907.pdfIn PDF document text
    • https://vorexumezekadan.weebly.com/uploads/1/3/0/9/130969740/kukidokorebo.pdfIn PDF document text
    • https://cdn.sqhk.co/wanazofemuvu/jbPkbhg/15442708803.pdfIn PDF document text
    • http://vknart.xyz/the_music_lesson_victor_wooten07f9j.pdfIn PDF document text
    • http://apsdd54gfv.xyz/cassette_tape_cover_template_photoshopt66u1.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/fgPji63/moon_patrol_online.pdfIn PDF document text
    • https://cdn.sqhk.co/wojipezusax/yljfLgi/factory_inc_mod_apk_unlimited_money_and_gems.pdfIn PDF document text
    • http://trelon.fun/55967809334u31j9.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/xovekolamoxe/bebas_italic_font_free.pdfIn PDF document text
    • http://punirasum.rf.gd/perfectly_inelastic_collision_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/didujuw.pdfIn PDF document text
    • http://fujesotes.epizy.com/waltz_for_debby_sheet.pdfIn PDF document text
    • http://kirigawegugava.epizy.com/berserk_2016_op.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_off0000d237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD237 5040 bytes
SHA-256: 603a7368b12a20b572f499c633f73b88a4441adbedc948b280d0f569ebcb917a
font_01_sfnt_off0000e355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE355 11664 bytes
SHA-256: 44bf42def2ff0948a2caa3b853a8f17e31540056c736caf8bff9c7495d1a8381

Open this report in the interactive analyzer, or submit your own file for analysis.