Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8f532ad2f26c48…

MALICIOUS

PDF

159.0 KB Created: 2021-04-08 20:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5c7bf26b90cebcdaaaf1556e8453cb1 SHA-1: 7e9591829a3a2a25eefb6beecc76598f0ec39ecf SHA-256: dd8f532ad2f26c48bc7db58dfc0d453946df6c8ce50aab796213239ca7fb4a86
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The PDF contains a high number of embedded links pointing to various domains, many of which are hosted on disposable platforms like Weebly, suggesting a link farm or phishing campaign. The primary URL, 'https://resalured.ru/strik?utm_term=what+do+firmament+means+in+the+bible', is a strong indicator of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/strik?utm_term=what+do+firmament+means+in+the+bible
    • https://cdn-cms.f-static.net/uploads/4453327/normal_60127b45a6477.pdf
    • https://tekopazaxalar.weebly.com/uploads/1/3/4/3/134348639/zabexeki_tafomuwep.pdf
    • https://rapusixub.weebly.com/uploads/1/3/4/6/134631860/poleri-wogesafodot-riwiguwifimagu.pdf
    • https://tuwozuzoleza.weebly.com/uploads/1/3/4/5/134509843/9c60def603ef519.pdf
    • https://cdn-cms.f-static.net/uploads/4378827/normal_6052aaeb224ac.pdf
    • http://pusovemolexed.scienceontheweb.net/pros_and_cons_of_genetically_modified_foods.pdf
    • http://prostotit.site/simple_valentine_cake_decorating_ideas4d7oz.pdf
    • http://lebedugipul.mywebcommunity.org/magoka.pdf
    • https://numuteje.weebly.com/uploads/1/3/4/6/134683694/a1b12d3075af0b2.pdf
    • http://tezibif.mygamesonline.org/voves.pdf
    • http://agent-ritual495.online/xfinity_x1_app_for_ipadjrdp0.pdf
    • https://bodobazanukabub.weebly.com/uploads/1/3/4/8/134889783/8442518.pdf
    • https://cdn-cms.f-static.net/uploads/4527859/normal_5fda3a3b07c75.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_dcae172b01d64428828f5276acd15a54.pdf?index=true
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_324f97e137274a2fa2a995ca479eed00.pdf?index=true
    • https://ab9101c8-a046-40a0-ba79-761bab9f3367.filesusr.com/ugd/61fb7c_3ac2408e1f0a4d66ac8fc1d1267dacb0.pdf?index=true
    • https://s3.amazonaws.com/papuja/obsessed_beyonce_movie.pdf
    • https://s3.amazonaws.com/potamotaz/39801243880.pdf
    • https://s3.amazonaws.com/pujirageg/the_lord_of_the_rings_cast_names.pdf
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_70576b7cb34e4616a6de83c4fd6b8854.pdf?index=true
    • https://s3.amazonaws.com/leteraxewe/71146431957.pdf
    • https://s3.amazonaws.com/moduxanakuri/9748850564.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000211b9.bin
39d6caba899effd4b045573a3d46b80c666318aa454a2f36de24743e5a39810e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x211B9 5300 bytes
font_01_sfnt_off0002239f.bin
6e86744a196c4df1b31a02c432b2333c562bc2c227f1a478e1777867044c8e56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2239F 17036 bytes
font_02_sfnt_off00025889.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25889 16204 bytes

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