Malicious PDF — malware analysis report

Static analysis result for SHA-256 c461719051703410…

MALICIOUS

PDF

82.2 KB Created: 2021-03-11 19:14:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 23e25917c3620a51a506ccb95c2e2c2a SHA-1: ad7fe92898ff675a69c74a93de654bdd152f9964 SHA-256: c461719051703410d85a0bf251deb3970f0919cbbbd164c834886dabb36133c7
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. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure indicate an attempt to redirect users to potentially harmful external sites.

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://seumenha.ru/wix?keyword=csun+spring+break+2020 PDF link annotation
    • https://cdn.sqhk.co/baradudapati/idgfieU/function_generator_kit.pdfIn PDF document text
    • https://cdn.sqhk.co/bimolixumotu/fgdicxW/wotifotaw.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/Iaxiije/all_animal_sounds_ringtones.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426556/normal_6039deee023ab.pdfIn PDF document text
    • http://misstourist.info/genomivenovorapuvkvfss.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/icibPif/24975051385.pdfIn PDF document text
    • http://insta-sale.site/lock_screen_live_wallpapers_ringtones_w._engine_mod6jy0p.pdfIn PDF document text
    • http://luminar4-download.xyz/26861589292qaqi7.pdfIn PDF document text
    • https://cdn.sqhk.co/wisisatofife/ibNiiij/bomabokixajotozasopekenop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415518/normal_6011d097bd5a9.pdfIn PDF document text
    • http://mixed-rootwork.com/15396124341cv31j.pdfIn PDF document text
    • http://mestorating.ru/free_medium_sudoku_puzzles_printableioqyv.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/Ohfjhjf/42950781082.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f1801c53-b3f5-4b94-a9b3-4bb8eb376a66.filesusr.com/ugd/af633f_0d43f62946c74008b40248bb379476d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c14d31a-cb25-4b90-86a5-a3851b35cc60/fegakajezozab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0959b39e-ab18-4c3b-b67a-a6fbb408c46e/thinkorswim_code_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58a51909-3379-4702-aa8e-b86b2d20600b/cyberpower_1500pfclcd_software.pdfIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_100df9c2dba14d379d88d2ae44d9fcc7.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_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 5340 bytes
SHA-256: 8dc11cfdf08c3fdcfda78a74fc932ce5b01f1df925adde10dbe72ae558944d04
font_01_sfnt_off000117ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AC 10684 bytes
SHA-256: 1d87bf962cf370cd8e9ef20b0712c47d543c3a1197f8c63dc227a5a5a7e27329

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