Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa16bb50eb9b59c…

MALICIOUS

PDF

82.7 KB Created: 2021-04-10 09:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ade1c566e40ebfdcb65d3ada075d4f63 SHA-1: 3f0436977c360806f6b73bbe1d715f5e72e15a95 SHA-256: baa16bb50eb9b59cc0622c508cbfc59faa3522932f94231d84491560fd717c8c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xajibur.ru/strik?utm_term=royal+road+to+card+magic+deutsch+pdf PDF link annotation
    • https://rijifupipi.weebly.com/uploads/1/3/1/4/131453414/0341b8fca6.pdfIn PDF document text
    • https://cdn.sqhk.co/nizaveni/bOifShh/radiant_heater_for_garage_propane.pdfIn PDF document text
    • https://cdn.sqhk.co/xokebuzizo/idSKxia/runinimuroponoridiro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449998/normal_6026f9b72d477.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501356/normal_5ff428339515e.pdfIn PDF document text
    • https://pixereboxos.weebly.com/uploads/1/3/1/3/131381799/1433948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420764/normal_6044df3fa23c6.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/crOghhi/fc_bayern_munich_players_salary.pdfIn PDF document text
    • http://xifizajutebov.22web.org/34345850862.pdfIn PDF document text
    • https://sejujilebenifej.weebly.com/uploads/1/3/4/8/134886687/6468916.pdfIn PDF document text
    • http://fozobojik.iblogger.org/73064379837.pdfIn PDF document text
    • https://cdn.sqhk.co/fofesali/ejgciay/vulekerabofefonutamumip.pdfIn PDF document text
    • https://wexasubofuxumeb.weebly.com/uploads/1/3/2/7/132740188/pubololado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463809/normal_5fdab0d43bab2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5da1c7d8-01c4-4175-bbf8-c25915566394.filesusr.com/ugd/1084fb_8991d7323dfc445f8432609e711bf42d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/ram_1500_towing_capacity_2015.pdfIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_6419173bd3a24bf7a065b43cbb9260c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/guided_reading_activity_3-_1_economics.pdfIn PDF document text
    • http://jivobolalozula.rf.gd/transunion_credit_report_free_annual.pdfIn PDF document text
    • http://napawurimilutil.rf.gd/comunismo_socialismo_capitalismo.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/journeys_6th_grade_spelling_list.pdfIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_b9948f8101954d53a3a7740d9bd1391a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zikeko/gutadorenubewi.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_off000102e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E7 5680 bytes
SHA-256: 2653427ca8b5dc6f92ef4631dec695f9d6139077a86cd8faad0991449805156e
font_01_sfnt_off0001161d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161D 11764 bytes
SHA-256: 374ed801e307a2f438fab390e43932c0bacf24965c63230cb8563070080ea806