Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ca97405f8b4ffe…

MALICIOUS

PDF

79.2 KB Created: 2021-02-06 08:58:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1916e803de5f85cc639912e54e9f87f4 SHA-1: 89aa3f46a5a980cffd746dc77b9aa488b92cf214 SHA-256: 18ca97405f8b4ffe3aa1d7f2eb74fca54f96dde2407d9f2d9aa3b123eb0cb3ba
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a redirector to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://crophysi.ru/aws?utm_term=guidepoint+singapore+career In PDF document text
    • https://cdn.sqhk.co/simikimira/ehiiiSI/amazon_fire_tv_remote_quit_working.pdfIn PDF document text
    • http://vabuletarikinil.iblogger.org/lowej.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/jeqgh1X/77729193772.pdfIn PDF document text
    • http://italia-doc.fun/69189963408ega05.pdfIn PDF document text
    • http://dream-stat.ru/madaratetijavjpq4y.pdfIn PDF document text
    • http://tunizunifegitof.66ghz.com/74267324029.pdfIn PDF document text
    • http://fruitslope.online/driving_distance_from_athens_to_santoriniqqcfx.pdfIn PDF document text
    • https://titobabedax.weebly.com/uploads/1/3/4/3/134317276/wutof.pdfIn PDF document text
    • http://thedouche.xyz/loan_officer_business_plan_templateznat2.pdfIn PDF document text
    • http://copyrightviolationcenters.com/python_3_math_modulekrx8m.pdfIn PDF document text
    • http://kukushka.space/el_anarquista_y_otros_relatoswdyrh.pdfIn PDF document text
    • http://tryse.xyz/90444680810it3mm.pdfIn PDF document text
    • http://muldwych.com/18832071310itsab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luzawuwu.epizy.com/gagexuzebidilo.pdfIn PDF document text
    • http://vuduluxepo.epizy.com/mafagurepe.pdfIn PDF document text
    • http://gofosuxubajo.epizy.com/react_bootstrap_login_template.pdfIn PDF document text
    • http://fonimegalidoxu.epizy.com/vobederodofoposesije.pdfIn PDF document text
    • http://jizofaludem.epizy.com/zosikomotozese.pdfIn PDF document text
    • http://kixexagejo.epizy.com/microsoft_outlook_android_activesync.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_off0000ec69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC69 2864 bytes
SHA-256: 9117bbf316fc2ea3b6e817c786b4239c6e639bc9bbc85041159577d557ec1aa5
font_01_sfnt_off0000f699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF699 5240 bytes
SHA-256: 00cdfd3d2d40ed199b923d5ff68046534b7e022fdbb7afe3b478c5e9de63b461
font_02_sfnt_off0001087f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087F 11548 bytes
SHA-256: 06924942c07cc079c05b8b77397808edd8e0f8ba20a32e453e6277a588bc35dd

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