Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ce8cf16a382485…

MALICIOUS

PDF

76.9 KB Created: 2021-03-29 17:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c58006acd09bc7ae0329131663d62c9 SHA-1: d50b1a6ae49eac4ae07e4297ac09b75273a609a2 SHA-256: 77ce8cf16a382485043288759a9daf0ae1c38129c3b2c20140d65bf10448193b
126 Risk Score

Malware Insights

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

The sample 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 hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/aws?utm_term=us+boiler+company+lancaster+pa
    • http://jevafurevozu.mygamesonline.org/fender_mustang_2_footswitch_schematic.pdf
    • http://tapopapebesawu.getenjoyment.net/classification_of_bantu_languages.pdf
    • https://cdn.sqhk.co/fojevimexu/jfVhcjd/bus_simulator_ultimate_play_online_free.pdf
    • https://cdn-cms.f-static.net/uploads/4378157/normal_602142359a75c.pdf
    • https://cdn-cms.f-static.net/uploads/4392470/normal_5fd1e421cb76b.pdf
    • http://wedipum.mygamesonline.org/anti_inflammatory_diet_to_lose_weight.pdf
    • http://gadatoreneperil.mygamesonline.org/32686593228.pdf
    • http://xuvavarapegu.mywebcommunity.org/mixarututabevegolavap.pdf
    • https://cdn.sqhk.co/vixonafom/pjdhgpO/86334349906.pdf
    • https://static.s123-cdn-static.com/uploads/4478968/normal_5ff2ca045356b.pdf
    • http://daludaja.getenjoyment.net/83683223144.pdf
    • https://cdn.sqhk.co/joxudilabi/ibidzpy/25651067084.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1dbecda7-1142-4049-9455-5cb449aae59b/ejercicios_de_estadistica_3_eso_doc.pdf
    • http://xotopusedewix.myartsonline.com/amazon_echo_show_2nd_generation_user_manual.pdf
    • https://uploads.strikinglycdn.com/files/ad022b60-1385-4277-b4da-3ccd73005def/kirovakotab.pdf
    • http://xowobovu.myartsonline.com/71532320112.pdf
    • http://fuxuxasezid.atwebpages.com/nisefepavaxibosojiruko.pdf
    • http://lojibovel.myartsonline.com/a_posteriori_knowledge.pdf
    • http://patudesaruvob.atwebpages.com/bhature_recipe_in_marathi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec61.bin
4caef37761b64db0b4dbede07601e34418081bd2800b3b680e983fb67c465747		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 5312 bytes
font_01_sfnt_off0000fe5e.bin
28b8622de7997ee2e389e9cef1188c4627032158ac4b13ce453c7ed86a62932a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 12144 bytes

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