Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa73a0edb9cd705f…

MALICIOUS

PDF

112.5 KB Created: 2021-03-08 08:44:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8bda2edb42bdd46efd0bf00dd5085c91 SHA-1: 4407ca91f57e0fdc29442c93f6dd3ecfca7b0066 SHA-256: fa73a0edb9cd705f563145c39c841aa13f6f44f5dd2896556b4ecbb0092ae694
66 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and a link farm heuristic supports this. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to lead users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://jacksth.ru/strik?utm_term=define+invisible+hand+government PDF link annotation
    • http://idealicaitalia-official.site/9260215256889zdz.pdfIn PDF document text
    • https://cdn.sqhk.co/lewonuvaxu/jMriejj/wileti.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/hKjUjab/lurozojirir.pdfIn PDF document text
    • http://begemot.space/honda_generator_eu3000is_battery_locationmixy9.pdfIn PDF document text
    • http://cardioactiveuficiale.site/cartoon_cute_animalsw5aoq.pdfIn PDF document text
    • https://cdn.sqhk.co/jobiwokojo/ZjaePii/survival_crafting_games_xbox_one.pdfIn PDF document text
    • https://kuvezuwuziteb.weebly.com/uploads/1/3/4/3/134388010/978448bafd39b.pdfIn PDF document text
    • https://xubejuvanexog.weebly.com/uploads/1/3/5/3/135311054/7703217.pdfIn PDF document text
    • http://mediaverifiedbadge.com/lesson_plans_on_similes_and_metaphors_for_high_schooloo6dd.pdfIn PDF document text
    • https://cdn.sqhk.co/nipumusawobo/9che67C/ruwufexipuwabupizid.pdfIn PDF document text
    • http://medicalpracticementor.com/binary_file_format_extensionuxcog.pdfIn PDF document text
    • http://instgrmmverifiedbadge.com/83271967926ahvyy.pdfIn PDF document text
    • http://marketeuro.pro/5925976115nvdqs.pdfIn PDF document text
    • http://technodom11.com/beroxamipegozoroberov3qtdw.pdfIn PDF document text
    • http://anrostore.ru/banibimolobosiredomodigek9ik5.pdfIn PDF document text
    • https://xisuludibu.weebly.com/uploads/1/3/5/3/135300694/gimuzedenijan_lemusifuvixa_jilavexelasa_jefanejatoro.pdfIn PDF document text
    • http://hurleyshamburgers.com/los_simpson_capitulos_completos_en_espaol_latino_20184nafa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfc63bbd-907d-4b29-8144-943c53a0d441/what_are_the_three_types_of_warfare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/749d5755-5afb-4164-a2f8-8fe5958d0d64/how_to_calibrate_omron_hem_7121.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/xinisifoxamaxawozeg.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/jekiritujizabisugojazevab.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/5e_arcane_trickster_spell_guide.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_off0001610e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1610E 5520 bytes
SHA-256: dba555cd72825a007ec147baa8a07c6b5731b7068943ea0bbc8ae8405e3c1146
font_01_sfnt_off000173b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173B6 12828 bytes
SHA-256: 1057edd78442abe52ff2783bd2b20a03b7a8575f0d183f6d192e548ed1151ab1
font_02_sfnt_off00019f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F26 16172 bytes
SHA-256: a9f76c04348edf99252db94f78af9155951ce727f276ebb06c31b068e277aa10

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