Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a533d15851813a…

MALICIOUS

PDF

71.5 KB Created: 2021-02-03 00:28:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0d937e26941762a2dd86283c2950204f SHA-1: b007beae5a31342fe02329f3975ac745335eaa50 SHA-256: e1a533d15851813a754de555e92b2cf427cc2593badc940fbcd5c456c4e79ec7
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect the user to malicious content.

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
  • 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://leonvi.ru/aws?utm_term=grid+template+areas+css+tricks PDF link annotation
    • https://cdn.sqhk.co/gadewekunel/gwEeZKb/52204734237.pdfIn PDF document text
    • http://ig-socialmedia.xyz/66206390505wbs80.pdfIn PDF document text
    • http://myfirstsite.xyz/28648789549h7g5f.pdfIn PDF document text
    • https://cdn.sqhk.co/xutujipux/cjf2Vja/minecraft_build_battle_server_ip_cracked.pdfIn PDF document text
    • http://bilkaita.space/wikulolevadd9b9.pdfIn PDF document text
    • http://wide-do.top/definition_of_scarcity_in_economicssdxq2.pdfIn PDF document text
    • http://nukels.xyz/vajijivolif39uvn.pdfIn PDF document text
    • https://cdn.sqhk.co/guvawatuzax/YajcOhg/98918555605.pdfIn PDF document text
    • https://cdn.sqhk.co/nanovinojon/YdjjiaI/xetojogej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366973/normal_5fef350b2e390.pdfIn PDF document text
    • http://remumajisipiv.66ghz.com/39992126633.pdfIn PDF document text
    • http://setofexperience.site/powijomumiwamoto85q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391015/normal_5fcc2aefb3048.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481520/normal_5fcfef27290ec.pdfIn PDF document text
    • http://hookup754.fun/central_vs_peripheral_route_persuasiond4qot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jijetebum.epizy.com/kewewuvije.pdfIn PDF document text
    • http://sajipesexadagon.epizy.com/61548011070.pdfIn PDF document text
    • http://mogerokefo.epizy.com/hoshizaki_ice_machine_cleaning_guide.pdfIn PDF document text
    • http://gaditerigasut.rf.gd/purorifedewedopi.pdfIn PDF document text
    • http://dotizedulowej.rf.gd/decimals_hundredths_and_tenths_answers.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_off0000d617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD617 5312 bytes
SHA-256: bd7dfb6fe9477a9137a37e94b9b088d3b60ca85dbb72a9b12446bc61679c3c30
font_01_sfnt_off0000e813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 11856 bytes
SHA-256: 2265c98f6d130352f2cdb3c1f56590166c783ecea654c4ceebc00043e63c7eef

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