Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ae9a294def7bc6…

MALICIOUS

PDF

71.7 KB Created: 2021-02-09 20:47:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f9ca5165f0e53000b93c598f8cfd341b SHA-1: 284422e56e6c437160d776fe184c0d7fbc9c7a17 SHA-256: 37ae9a294def7bc6e1be0e2a3403132dbbea2db4b2d181862f807262c9ed1f37
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous embedded URLs pointing to disposable hosting and potentially malicious domains suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=puducherry%20express%20dadar%20platform In PDF document text
    • https://static.s123-cdn-static.com/uploads/4447906/normal_6008e20541110.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412413/normal_5fcf940ec65a0.pdfIn PDF document text
    • http://rostov-mobile-doctor.ru/gloomhaven_cragheart_perks1l839.pdfIn PDF document text
    • http://losinglotterynumbers.com/989446108269ybr5.pdfIn PDF document text
    • http://esclub.pro/51166042288auup5.pdfIn PDF document text
    • http://shoop-fh.ru/ligavivupgxxs.pdfIn PDF document text
    • http://funusiwevig.22web.org/39582526629.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379046/normal_601e67b0af1aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454973/normal_5ff375b5c3b83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448733/normal_60186914ac5c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xewenofos.epizy.com/55813453134.pdfIn PDF document text
    • http://xakufidadalajup.epizy.com/wytyczne_bls_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/new_movies_telugu_wap.pdfIn PDF document text
    • http://jeparilusukopof.epizy.com/pulival_kalyanam_aaru_paranju_song_free.pdfIn PDF document text
    • http://puligop.epizy.com/vuxirenukikenezatig.pdfIn PDF document text
    • http://topagujowulefe.epizy.com/80851256534.pdfIn PDF document text
    • http://suvubojetixag.epizy.com/powerpoint_a4_portrait_templates_free.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD204 5568 bytes
SHA-256: 62b208cc9b8ed0be9a5515a3787375611ddf298823165cdf181c01334db80e0b
font_01_sfnt_off0000e4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D4 14612 bytes
SHA-256: 8807bdd34e9b6c2ea4757404b8749bff1da665210f69686fd412e96ab187ae09

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