Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95833dd50b119ec…

MALICIOUS

PDF

78.7 KB Created: 2021-02-20 12:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a36954f587d64ed305861a0e151957de SHA-1: 40ceda0e169742924830da9ceee39ce777ba9c59 SHA-256: a95833dd50b119ec422e4d2db4845080b7ffa8b9b870f1cc95d809d3cff4ac66
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded links, one of which, 'https://crophysi.ru/wb?keyword=database%20administrator%20job%20description%20examples', is identified as a known malicious redirector. The document body, though heavily obfuscated, appears to be related to job descriptions, suggesting a phishing or scam lure. No scripts were extracted, but the presence of malicious links is a strong indicator of malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=database%20administrator%20job%20description%20examples In PDF document text
    • https://wiwofuda.weebly.com/uploads/1/3/2/3/132303082/farovekunano.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeform.com/grand_theft_auto_online_apk_free_downloadsgsqo.pdfIn PDF document text
    • http://beamorem.com/42973792163hnahd.pdfIn PDF document text
    • https://posesisex.weebly.com/uploads/1/3/5/3/135332701/menokirutuzimo.pdfIn PDF document text
    • http://itdiscount.info/atomic_number_119i5yve.pdfIn PDF document text
    • http://trikotoria.ru/excel_transpose_entire_worksheetrtem1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464314/normal_5fc593c1c8dcc.pdfIn PDF document text
    • http://domainlimax.xyz/66413817869khqly.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388420/normal_5ff109f7dde13.pdfIn PDF document text
    • http://freshka.fun/software_development_jobs_remote1uctr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369324/normal_6006b10c82ced.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452851/normal_601d965d0ba02.pdfIn PDF document text
    • https://vetolotex.weebly.com/uploads/1/3/1/3/131379132/nefinabowedadumo.pdfIn PDF document text
    • http://hotita.fun/tower_defense_simulator_wiki_zombieslcelr.pdfIn PDF document text
    • https://tilawifi.weebly.com/uploads/1/3/4/4/134480999/mujavalalesuver_ruwus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405459/normal_602b394aa4fe9.pdfIn PDF document text
    • http://jsexj.fun/momowozi7mbyy.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/lusegokaves/fubitafuviwapaxivolibi.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_off0000dd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9E 5500 bytes
SHA-256: 3860c913eab18eb3c4777def2e5eb7c58e402f5c42e398433241cefb13d147ce
font_01_sfnt_off0000f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 11028 bytes
SHA-256: c20c89cd758dfdbedd9900e75e0fab62ee1b707a91ab3daa3736540a9268749f
font_02_sfnt_off0001160d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160D 16080 bytes
SHA-256: 8f6ddafd3b0ce2004b9503adf603897a58143e210ca714e8dcfcba1b249cf112

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