Malicious PDF — malware analysis report

Static analysis result for SHA-256 42eed75c59167f9f…

MALICIOUS

PDF

75.8 KB Created: 2021-04-07 20:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b907195f44fb54405695b3ebfae5c02a SHA-1: 9c32f1db3e952b4a6b436f9012bea80722105453 SHA-256: 42eed75c59167f9f9c70f7452fc4e9fbfa17c8a922b9eac65243a42ba33e5dd8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and acting as a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/aws?utm_term=white+rodgers+thermostat+battery+replacement
    • https://kojaxinepizoju.weebly.com/uploads/1/3/1/8/131856409/niveretasomeg_joguwa_bejozizusanelim_jasiwixulaza.pdf
    • http://lexisunat.iblogger.org/free_sweetheart_bodice_pattern.pdf
    • http://mxsale.info/northlink_college_application_form_2019tfhm3.pdf
    • https://cdn.sqhk.co/xupodafib/jwOU6gh/occupational_therapy_assistant_schools_in_texas.pdf
    • https://folimero.weebly.com/uploads/1/3/2/6/132695744/e01cd59.pdf
    • http://mmuuue.space/how_to_pair_2_jam_double_down_speakersrv67e.pdf
    • http://checkmycredit.info/algebra_1_textbook_common_core_edition5lree.pdf
    • http://devlp.club/60147686631zyp1v.pdf
    • http://kulokozataxat.22web.org/39219714204.pdf
    • http://fiziwafofekaku.mygamesonline.org/learn_fluent_english_in_30_days.pdf
    • http://tactical-jacket-sale.shop/gender_trouble_summaryacnge.pdf
    • http://pivolirarorip.mypressonline.com/tubomesutinixopif.pdf
    • https://posajegodat.weebly.com/uploads/1/3/4/4/134477503/cf5e1e054bff5.pdf
    • https://koloputumoti.weebly.com/uploads/1/3/4/8/134887370/bolekoropupupuraxupi.pdf
    • https://dorijalasenotom.weebly.com/uploads/1/3/5/3/135327318/bagotevipa_pavivijakevigip.pdf
    • http://gagimubu.mywebcommunity.org/html2pdf_set_default_font_arial.pdf
    • https://cdn.sqhk.co/vedoreket/ljdgfji/entropia_universe_hunting_guide_2017.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://lugifer.onlinewebshop.net/17126649463.pdf
    • http://jilabof.epizy.com/free_christmas_templates_for_word.pdf
    • http://fexojuvaf.rf.gd/geometry_construction_worksheet_10-2.pdf
    • http://lisunamubeso.epizy.com/numbers_1_20_worksheets_for_kindergarten.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_off0000dda3.bin
2160cf48d5c66e276f802b6b33fe6331db4f9fa87444673c0acd0831f57a9084		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA3 5532 bytes
font_01_sfnt_off0000f059.bin
f944d1a853c6bede4d85bacb8d2345dfb6be6018ada46a4b6477ec0e3027369d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 10352 bytes
font_02_sfnt_off000113d4.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113D4 4324 bytes

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