Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a115cdbe41dd540…

MALICIOUS

PDF

76.7 KB Created: 2021-03-28 21:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f266d6b4158ef3dc36770bed549ad870 SHA-1: fe8417a7b725e734b43c2e8cee087028438206dc SHA-256: 4a115cdbe41dd540385330a119ba4ebeb332d05161fdcd051671e9b0fc59b27a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive link farm are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=keurig+2.0+coffee+maker+user+manual PDF link annotation
    • https://cdn.sqhk.co/pinofizulag/dfsejiR/29729927912.pdfIn PDF document text
    • http://shtancircul.site/53167106072c0xcx.pdfIn PDF document text
    • https://xonutupusuvulin.weebly.com/uploads/1/3/1/8/131871786/3394678.pdfIn PDF document text
    • https://cdn.sqhk.co/vavetiset/NnjhWdv/informantes_definicion_segun_autores.pdfIn PDF document text
    • https://cdn.sqhk.co/dimusokobab/LjeGjaH/zekabejagataga.pdfIn PDF document text
    • http://raisinsapp.pro/seximiduwarimubad9okj.pdfIn PDF document text
    • https://jisetufazuv.weebly.com/uploads/1/3/5/3/135307323/efd1e5cd.pdfIn PDF document text
    • http://study-english-04.space/98787071737vgbdj.pdfIn PDF document text
    • http://natfreshik.fun/eureka_forbes_vacuum_cleaner_service_center_in_jaipur2odhc.pdfIn PDF document text
    • http://naturaleone.space/elite_platinum_air_fryer_recipesi2552.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/gijb5ig/wewasu.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvesanap/gjfL2jj/can_you_just_throw_knives_away.pdfIn PDF document text
    • http://resimpub.com/vupojavovujibukonoloxaso9cp2x.pdfIn PDF document text
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/nitiwikop_manozixi_dakegimiveb_gotediguvebamo.pdfIn PDF document text
    • http://hookup754.fun/learn_to_sing_in_tune_online_free0m0cu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_fa5fd1f6503f44038c74b368d2947ea9.pdf?index=trueIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_69e00a00298645fbac37dba43d5a0233.pdf?index=trueIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_2a5c8496980c42c198ad72571af80d94.pdf?index=trueIn PDF document text
    • https://19527f6f-7821-4b33-8e58-d909ab9a203f.filesusr.com/ugd/b18fc6_6e746c3eee114b19a243ebf5226138d6.pdf?index=trueIn 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_off0000ed8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 5540 bytes
SHA-256: 23d5f296dd890fb783aaebf5a24592dbcee1ce50c2bb7c8feb52950df91eede3
font_01_sfnt_off0001005d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005D 10760 bytes
SHA-256: d6949aa490aedba3028954cb27466cc0f9ce36d308a9b282d4797ed017d366fe

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