Malicious PDF — malware analysis report

Static analysis result for SHA-256 5831ad646555654b…

MALICIOUS

PDF

71.4 KB Created: 2021-02-28 12:38:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 162ea800afb863f03bd803a99ef5edc4 SHA-1: 8679f98c20791181c63e16b4c5b01c58c2a90749 SHA-256: 5831ad646555654bf1dc2845ad675e1e9cd35c0f4855de49f1ef16d4622a26bf
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain search-like queries, suggesting a phishing or scam attempt to direct users to malicious sites. No scripts were extracted, but the presence of malicious links and the overall detection profile strongly indicate a phishing or redirection attack.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wb?keyword=how%20do%20you%20connect%20to%20my%20hp%20officejet%20pro%208610 In PDF document text
    • http://best-ital.fun/85546973240e27f0.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/why_is_the_magna_carta_so_significant_in_world_history.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/6901129624.pdfIn PDF document text
    • http://kigumelez.medianewsonline.com/hillsborough_county_school_calendar_2018.pdfIn PDF document text
    • http://luwinilulurop.mywebcommunity.org/how_do_i_connect_a_logitech_wireless_keyboard_and_mouse.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/watorozilufagijafa.pdfIn PDF document text
    • http://junumidutuzakox.getenjoyment.net/sony_a300_camera_user_manual.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/koputif.pdfIn PDF document text
    • http://folejaf.mypressonline.com/sutosubetofoxegagomopan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://risafajafefe.rf.gd/bazugelepipubole.pdfIn PDF document text
    • http://mumunetade.epizy.com/bingo_dauber_activity_sheets.pdfIn PDF document text
    • http://lidizuderezoza.rf.gd/15167489597.pdfIn PDF document text
    • http://birotizedu.epizy.com/android_email_app_with_dark_mode.pdfIn PDF document text
    • http://pagiburisodu.epizy.com/livewire_ts_6.0_powerstroke.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_off0000db29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB29 5748 bytes
SHA-256: 1e2ed11f148a75e4e9d4382c98638278713dceb66f861444683c35c24bbac193
font_01_sfnt_off0000eeb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 9868 bytes
SHA-256: c37c1612a6d104f5cf9779deca35920ceb50de9b1bcb472fa609be003160c10d

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