Malicious PDF — malware analysis report

Static analysis result for SHA-256 06438b2e5ad680da…

MALICIOUS

PDF

84.5 KB Created: 2021-03-25 10:26:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3d39f133cd5350357874bf2071e3d668 SHA-1: 476084120cad9c1eb05f1e3c5a013cef076933a1 SHA-256: 06438b2e5ad680daf6695d12f2d116950d1ebc192010a2db4f14312c624cda39
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing operation. The primary external URI, 'https://resalured.ru/award?keyword=urethra+stricture+pdf', indicates a lure related to medical search terms to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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=urethra+stricture+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404524/normal_6057c2f2b588f.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CBzRJjj/4831920716.pdfIn PDF document text
    • http://goodshopsales.xyz/sapoxedivimobamipiver2ea9n.pdfIn PDF document text
    • http://fullstacket.online/why_is_positive_discipline_more_effective_than_punishmenth6kxm.pdfIn PDF document text
    • http://meetporte.xyz/756075016657utli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382408/normal_5fdc3b43ea44f.pdfIn PDF document text
    • https://cdn.sqhk.co/samekikogeri/cjfXzhf/letter_reversal_worksheets.pdfIn PDF document text
    • https://ponozivodu.weebly.com/uploads/1/3/0/7/130775347/6a7e35f1af7104.pdfIn PDF document text
    • https://galanopudaxu.weebly.com/uploads/1/3/4/1/134109153/navetu-lezadewokoz-rodokamo.pdfIn PDF document text
    • http://cafechorsu.ru/which_undercounter_fridge_reviewslq1jt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487632/normal_5fe9c771ca2a0.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/simujix/happiest_baby_on_the_block_dvd_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/aptoide_for_iphone_6.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/aeronautical_information_publication_aip_turkey.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/doyles_guide_criminal_lawyers_brisbane.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/aparajita_tumi_movie_song.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/40374888055.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/professional_development_goals_examples_finance.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_off0000f81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81A 5204 bytes
SHA-256: 1f427831a39ead0217fd6818febe4ec18b79edb5f91d5a43134a4b703b30cf28
font_01_sfnt_off000109cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CB 11148 bytes
SHA-256: ea95b54ba226614efd6ef79c6639ffe2036e28ec16fb2daa3b3971eebe22af54
font_02_sfnt_off00013031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13031 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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