Malicious PDF — malware analysis report

Static analysis result for SHA-256 9917105b8b45e6e8…

MALICIOUS

PDF

76.9 KB Created: 2021-03-14 23:08:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f5caa4cab88c9d06c6fe1808d759826 SHA-1: 2c77bb2ecb7f74a75c4567deacffba21dc72a046 SHA-256: 9917105b8b45e6e8a39bdf15a4df7b1df776788a662dbefd5e6051c923ef9034
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://leonvi.ru/award?keyword=new+cutting+edge+upper+intermediate+teacher+s+book+pdf
    • https://cdn.sqhk.co/zirizowesaw/cuszihJ/world_cup_1990_qualifying_concacaf.pdf
    • https://wepidunobon.weebly.com/uploads/1/3/1/4/131452842/1482825.pdf
    • https://jikujumek.weebly.com/uploads/1/3/5/3/135318263/fadodum.pdf
    • http://neridofufuleteg.scienceontheweb.net/maths_book_for_class_8.pdf
    • http://bcpzonasegur4viabcp.com/wotonubirakfpcc.pdf
    • http://pogawubujogeje.mypressonline.com/84798018342.pdf
    • http://naliputa.mywebcommunity.org/50113541049.pdf
    • https://cdn.sqhk.co/kilatelazobe/CsheOih/speedometer_app_for_golf_cart.pdf
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/7a6b0a2d.pdf
    • https://cdn.sqhk.co/puzadowoke/r5jhZzd/youtube_learn_to_sing_in_tune.pdf
    • http://cosmicgig.com/vezokiriwexuzunuselonagn0qc.pdf
    • http://bumufirila.mygamesonline.org/kojelitate.pdf
    • https://cdn.sqhk.co/ladesajisama/iRjc8J3/ski_jumping_live_tv.pdf
    • https://soxapibojewaw.weebly.com/uploads/1/3/5/3/135345372/kotas.pdf
    • http://xejopegig.mypressonline.com/washington_gas_customer_service_number_dc.pdf
    • https://piwevowukitibe.weebly.com/uploads/1/3/1/4/131454699/1345088.pdf
    • http://italdom.fun/cmos_digital_integrated_circuits_analysis_and_designnot21.pdf
    • http://popisazono.getenjoyment.net/teperetokefigetoxaxo.pdf
    • https://cdn.sqhk.co/dagozuwemep/hhtjqjf/lepizadi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://pasadoru.epizy.com/34813437244.pdf
    • http://falogivaxaf.epizy.com/29437833200.pdf
    • http://piwolimosopobu.myartsonline.com/manual_gopro_hero_3_silver_espaol.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1c7.bin
071141385a6a81729693b34db28e3343858abe6e27cca0d02a9c899b8873d4ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 5684 bytes
font_01_sfnt_off0000f4f1.bin
9969598812778f21b4ad522ea8b6ef3354699793d2e5aa6ca097df0388588fad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F1 10132 bytes
font_02_sfnt_off000117b5.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117B5 4324 bytes

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