Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d5662354aa8aae…

MALICIOUS

PDF

78.2 KB Created: 2021-04-10 17:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6f44e31c4c6cd96c2e1eb68b6675eea0 SHA-1: ebf310c52d40aab5c3f02ae788477fe1b100a39b SHA-256: 84d5662354aa8aae4ed4b7b7de84040a245d43f7a7cca9b9f00ff14e62d16fb8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple embedded URLs, with a high-confidence heuristic flagging it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to a 'data science academy bootcamp' and the authoring application 'wkhtmltopdf', suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://golowaki.ru/strik?utm_term=nyc+data+science+academy+bootcamp PDF link annotation
    • http://wotidoteked.mywebcommunity.org/chaos_theory_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mirofifuba/egjfux3/zalegenadi.pdfIn PDF document text
    • https://cdn.sqhk.co/lidupusumoj/W7iHoWv/sas_zombie_assault_3d.pdfIn PDF document text
    • http://pelinebaj.mypressonline.com/book_writer_name.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/gjg9GWU/kuparopilawozegetinegizos.pdfIn PDF document text
    • https://badevejolaf.weebly.com/uploads/1/3/4/8/134867981/nawatagoso_vazitekeva_kenopibaj_tabulog.pdfIn PDF document text
    • https://ganokupojedozo.weebly.com/uploads/1/3/4/8/134890080/9211860.pdfIn PDF document text
    • https://xifuvago.weebly.com/uploads/1/3/0/8/130813557/4017200.pdfIn PDF document text
    • https://lulipelewofepo.weebly.com/uploads/1/3/0/8/130873877/medirabagerufimalumu.pdfIn PDF document text
    • https://cdn.sqhk.co/xorilulog/hdYmhcu/realistic_cake_artist_near_me.pdfIn PDF document text
    • http://tulusujubige.mygamesonline.org/apsrtc_ngos_bus_pass_application.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/xebugopixutunedesuwigon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/209cba1a-0342-40bb-bfd9-376e0bccef46/iphone_5c_price_in_nigeria_slot.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/amazon_kindle_app_store.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/99775480044.pdfIn PDF document text
    • http://dapekafuxururo.myartsonline.com/34373805764.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/g._i_sheet_thickness_gauge_in_mm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de3d80ac-1898-4a95-899c-3c57d3796731/mackie_cfx12_mkii_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a9d0298-08d8-46f1-a695-6de9ea696c75/what_channel_is_heroes_and_icons_on_fios.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 5092 bytes
SHA-256: 5868386594b274f4b41d05b0310ff2854ef6d6ec71bc919c8c106cc70ff4dba2
font_01_sfnt_off0000f752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 11248 bytes
SHA-256: 280d34805a5dc11a7fd96a5719e5dd2f7168a6c788c90ed2984befad2f017206
font_02_sfnt_off00011d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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