Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd16eb65d715ab54…

MALICIOUS

PDF

76.2 KB Created: 2021-03-17 16:02:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1858edb984a1796c0cc2a3a4da35baca SHA-1: 044da398a1507131c7bc09160bad70c180f24f18 SHA-256: dd16eb65d715ab54ba435bd264a19cc87805375e5ba94e8327c7b6e9c2241a6e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary malicious URL identified is https://dugedepap.ru/strik. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links strongly suggests it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/strik?utm_term=what+are+the+principles+of+communication+in+nursing PDF link annotation
    • https://warolola.weebly.com/uploads/1/3/4/6/134600536/6751975.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/GifhRTA/56205242156.pdfIn PDF document text
    • https://cdn.sqhk.co/xupebasolaw/4x58iij/tugemowivavubu.pdfIn PDF document text
    • https://xusemiwo.weebly.com/uploads/1/3/4/8/134899199/ledimewikoxaxowipib.pdfIn PDF document text
    • https://cdn.sqhk.co/raxavetaletu/heANih7/dosazakatujowa.pdfIn PDF document text
    • https://kasezikibojeg.weebly.com/uploads/1/3/1/8/131871727/guwodu-zumutulososeve.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/aSe4A7Z/41889101621.pdfIn PDF document text
    • https://cdn.sqhk.co/ramidazumiko/hiW1Bjh/catalase_lab_answers.pdfIn PDF document text
    • https://gademivovemoxu.weebly.com/uploads/1/3/1/3/131383546/9d4cc.pdfIn PDF document text
    • https://wosubazaroden.weebly.com/uploads/1/3/0/8/130813518/xatunotuvi.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/36a970b4-c93b-410c-a33d-4087816a1dfd/how_to_cook_quinoa_in_tiger_rice_cooker.pdfIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_53aa1d00669844af84957dc13e794b44.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/33316345536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8718280c-9eeb-4e5b-9a9c-7ca157ab0e9d/is_day_trading_illegal_on_td_ameritrade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c96ee1bb-47bc-482e-9fc6-64ad77cea5ae/tartine_bread_recipe_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0ab73f2-6009-496d-bd15-0fb7ac3c2e43/92287727288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77d53f9f-8327-4e78-aa55-aea8410b76fc/engineering_mechanics_statics_3rd_edition_pytel_solution_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/acls_guidelines_2019_medications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/087ac5bb-a45f-417f-bba3-c7e1acc3e50d/tp_link_tc_7610.pdfIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_49667020fbd4493c82c12aa6b3e0f559.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/69dc701e-c15d-405f-8ea9-1f41fb0adc8d/how_to_fix_capitalism_porter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b2d786c-19e6-4992-96cd-473bf714ab7c/56734525073.pdfIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_710023896a6c43a4bd7fa608b5797af5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/00397c77-dfdc-4e02-b799-a46a81ca01cd/what_does_the_word_mito_mean_in_italian.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/48458247389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d37a612c-75f8-4ce3-a246-2781812fd354/60714694121.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 5444 bytes
SHA-256: 73730b403062b50525878a84cc13fc3930c55b87bad772171b6c76a0fb875067
font_01_sfnt_off000100c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C6 9940 bytes
SHA-256: 4d6a15f37b7b41901643ee81f873c535c5aa8b693dca506a7b2617363fdc1bf0