Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3352d97c20d203…

MALICIOUS

PDF

74.5 KB Created: 2021-04-01 18:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2c012e4084c83df43bb6b4eec1deded2 SHA-1: a252fbe4a2afdd6150947aad5b65e9ca84aa629a SHA-256: ad3352d97c20d2037ac1f8cb49c78dfa2bcf56a1911b66c90971f4e407b86bcf
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is a link farm hosted on disposable domains, and multiple external URIs were extracted, pointing to suspicious domains. The presence of embedded URLs suggests the document is designed to redirect users to malicious sites.

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 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://resalured.ru/wix?keyword=the+crucible+packet+answers+act+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474739/normal_6064d25610cba.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/jorinogiziroxugaromamg8d1.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/hdajbau/14273096798.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453741/normal_604f5b6235bd0.pdfIn PDF document text
    • http://extrameets.fun/a_cup_of_tea_katherine_mansfield_in_hindieofn4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387037/normal_603937cf1cd42.pdfIn PDF document text
    • https://cdn.sqhk.co/jigidokasaga/G88jjKs/46999678112.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369514/normal_5fef590946a0a.pdfIn PDF document text
    • http://usechambre.xyz/koworumudnw13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370087/normal_5ff674a0aab40.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwuvume/Xp9hdYN/strategic_planning_workbook_for_nonprofit_organizations.pdfIn PDF document text
    • http://subbellassecret.com/896159666899usd.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/iHhbS0y/tidituzivojanubumawakopil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479454/normal_5fe3ec00129c4.pdfIn PDF document text
    • https://cdn.sqhk.co/rutisifelom/dheifhd/60211346377.pdfIn PDF document text
    • http://extraevents.ru/nalanowamiriwxr19y.pdfIn PDF document text
    • http://goshop32.site/lugegapajidujijibefodwpmd7.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/aYjfsrY/shoot_zombies_game_download_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 5088 bytes
SHA-256: f23c46b10521548fab6e4cacafdb4005ed540a411fa7c5e2dd7488561c0bda89
font_01_sfnt_off0000e987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE987 10948 bytes
SHA-256: 7c8eb35b41920b1eefee49fb65a605d98e1a1d53c2f0ef0f54a2ba164c7b7f65
font_02_sfnt_off00010ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC8 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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