Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a7e1c55fb33466…

MALICIOUS

PDF

84.2 KB Created: 2021-04-06 15:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: aebadca10508a996eccc568bcb8469de SHA-1: 20779ac69cfadfd1eddff5b01d90f8f6478ff1fa SHA-256: 39a7e1c55fb3346635ab6ee0a3254116b7887d17fa11b55f4c0e328bec25e55b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/award?keyword=amharic+bible+names+pdf PDF link annotation
    • https://ravojinukof.weebly.com/uploads/1/3/4/4/134476618/jezitesiwofafidi.pdfIn PDF document text
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/1656787.pdfIn PDF document text
    • http://cashbackmoney.info/latisipagidemegisopideruyuc40.pdfIn PDF document text
    • https://kunepupavebi.weebly.com/uploads/1/3/4/0/134095879/2255385.pdfIn PDF document text
    • https://lipijunozawisek.weebly.com/uploads/1/3/4/7/134721324/buvizubizada.pdfIn PDF document text
    • https://cdn.sqhk.co/tazuxalana/ghTPVjg/sonny_bono_net_worth_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/wadalibituge/dPXhieV/monster_truck_heroine_name.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzomorikat/6ahAgjv/canvas_student_view_rubric.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495558/normal_60421c54212a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447265/normal_6013222070b2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387240/normal_60608cd6e2f5e.pdfIn PDF document text
    • http://erogancolumbia.site/how_to_repair_sharp_tvc22vj.pdfIn PDF document text
    • http://mstmail.space/vexizoniniwoxizawaxoy33e4.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/ig1licQ/fighter_spacecraft_model.pdfIn PDF document text
    • https://befapoge.weebly.com/uploads/1/3/1/6/131637854/kubiwodugerelino.pdfIn PDF document text
    • http://rezonansmusic.com/shadow_project_bomberovg3g.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/jNVhbgi/lefisukunoxusazoden.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dozuga/online_us_visa_application_form_in_ghana.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/tuxivopowebegekamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa197c67-a295-4aeb-81f5-4f2c0f765a82/matlab_function_return_multiple_vectors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74c2b68b-d06e-42bc-8ccc-8c2a191b520f/webixukawenob.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/sogerefudibumese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa2d7970-6966-4ee0-92dd-cc47732b5195/dadusibuw.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/kaun_hai_woh_bahubali_song_lyrics.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_off0000f5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A0 5524 bytes
SHA-256: e7c232cd9eff3e317de981da89f9826c12a4cb56bedd80bdec37acf5d1112572
font_01_sfnt_off00010834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10834 10548 bytes
SHA-256: dbc12eb0038afb553886de247b2832f6b78154b1e7cacafc48616c77950b0bdf
font_02_sfnt_off00012c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C65 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501