Malicious PDF — malware analysis report

Static analysis result for SHA-256 b780fab3fe669f5c…

MALICIOUS

PDF

79.0 KB Created: 2021-02-07 21:31:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 46e4008064b31298f4ed265c152463cf SHA-1: ea200126d2cf01e1eeaf4b918f02fc15494d93bc SHA-256: b780fab3fe669f5c59aad71b68ef75d0b928272ed555877a4a46fd755788cc4f
134 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm and a phishing lure, specifically mentioning an invoice or payment context. The embedded URL points to a site that appears to be a landing page for a 'free course registration form', aligning with the phishing pretext. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest malicious intent, likely to redirect users to a malicious site for credential harvesting or further payload delivery.

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/aws?utm_term=free+course+registration+form+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379726/normal_60144c00e0e2e.pdfIn PDF document text
    • https://cdn.sqhk.co/sazalevimit/PhbvCBs/infection_control_today_credibility.pdfIn PDF document text
    • https://cdn.sqhk.co/fujonexa/hcjfggu/xda_forum_tv_box.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480408/normal_5fdb9110b1f60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427085/normal_60096a48d8389.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390641/normal_600b3a63ac37f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480414/normal_5fcc912f39072.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/e58HjiD/xomagavezolawiregox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504791/normal_5ff979c9d7815.pdfIn PDF document text
    • https://cdn.sqhk.co/lenufetimop/1WQLX0A/beach_buggy_racing_2_ps4_store.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/dCyNjb9/7765280054.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/sizadagazagaj/fbise_date_sheet_hssc_2019_part_2.pdfIn PDF document text
    • http://fogevodazeta.epizy.com/silorifew.pdfIn PDF document text
    • http://powazov.rf.gd/network_architecture_diagram.pdfIn PDF document text
    • http://zifofupox.rf.gd/tezoti.pdfIn PDF document text
    • http://fiwimawa.rf.gd/98908287470.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/adelanto_jail_inmate_information.pdfIn PDF document text
    • http://dalelotagu.rf.gd/jifetadajejus.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/anaconda_1_english_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/excel_vba_range_address_with_sheet_name.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_off0000e98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98B 5172 bytes
SHA-256: 69a30277b94d4f64e298640d7863304f22071740b8906dca094dbb8f23fc015d
font_01_sfnt_off0000fb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0B 10436 bytes
SHA-256: cd6dfe8148ec20e1a8678d87e7486fb4e90909ae3adbbcfcbc2e7db02fcc471b
font_02_sfnt_off00011e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9B 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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