Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73ccd1d02036032…

MALICIOUS

PDF

89.9 KB Created: 2021-03-19 14:27:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7c293876260477bcf02f26cf62718b2e SHA-1: 5f3779b13bfd4555f83ae9262fd70c4ecf22f288 SHA-256: b73ccd1d02036032b17609c155327a6a038f5f790b7eca5defc4a216c2e037fc
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, indicating the document's purpose is to serve as a deceptive portal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/award?keyword=algebraic+expressions+examples+pdf PDF link annotation
    • https://cdn.sqhk.co/vimexuda/fjbgfib/land_conquered_by_genghis_khan.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/hgchgif/air_hockey_game_online_unblocked.pdfIn PDF document text
    • https://mazanotofubemiz.weebly.com/uploads/1/3/2/6/132681192/razowifurukituw.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/buwafipajofasi.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/ibVfcrE/55450890000.pdfIn PDF document text
    • http://kumululurug.scienceontheweb.net/behaviorally_anchored_rating_scale.pdfIn PDF document text
    • https://wipumerafuzu.weebly.com/uploads/1/3/4/7/134729269/3918343.pdfIn PDF document text
    • https://cdn.sqhk.co/xokekekav/jb6Jgf3/12829661701.pdfIn PDF document text
    • http://tuworiki.22web.org/buddha_teachings_book.pdfIn PDF document text
    • https://tidosivapozagul.weebly.com/uploads/1/3/4/3/134390518/2a4cea.pdfIn PDF document text
    • https://zatagigozot.weebly.com/uploads/1/3/0/7/130775916/bazodifatut_lalejoju_sonowemox_mavofoxerolag.pdfIn PDF document text
    • https://miletotafog.weebly.com/uploads/1/3/4/7/134758503/4005516.pdfIn PDF document text
    • https://cdn.sqhk.co/dunokufimove/gdnsLgj/sales_administrator_interview_questions_and_answers.pdfIn PDF document text
    • https://wokulenazaxur.weebly.com/uploads/1/3/4/7/134744474/2289279.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dusegakalo.epizy.com/causes_of_covid_19_pandemic_crisis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be4fbb1-f80a-40e8-8994-f828fed615c7/3964071729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa951294-e2c1-4da8-b2cc-a9eff40c805a/59443333058.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aadf0393-5fc5-43c4-8253-27329c554822/wowazogiwu.pdfIn PDF document text
    • http://welojorolepone.rf.gd/89919198545.pdfIn PDF document text
    • http://somasetowijo.myartsonline.com/accidental_plagiarism.pdfIn PDF document text
    • http://wutorokanotomav.onlinewebshop.net/tusoxezagilabibiwajinoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3bc330f-7cd7-4dbd-a35f-ad6616ef9c5d/hitachi_c10fce2_10-inch_compound_miter_saw_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10942 5672 bytes
SHA-256: 366ac84d67e5f0b464e5d00e05a5e213731d61ac01a74b004d515ddc2d6f59b0
font_01_sfnt_off00011c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7C 11296 bytes
SHA-256: 751051ab021127dcaa408bff3076a12467421bdc1d8822ba8d5598d65f8f5f7d
font_02_sfnt_off0001435f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1435F 16096 bytes
SHA-256: 3bb08857b08983a257d5a2052628e18542fd51c8d29f5bbef87ea8b8ace00841