Malicious PDF — malware analysis report

Static analysis result for SHA-256 e541e049a6488b6f…

MALICIOUS

PDF

71.9 KB Created: 2021-06-08 19:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 341ad685c49a543e38b56c82c5c91af3 SHA-1: 8b9fbb13a9b82cf6eeec95450f841fdb26fb6cc8 SHA-256: e541e049a6488b6ffda17c6075509ada6aaa146df04989c5348291ed11edfc8b
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, indicating a phishing or trojan distribution attempt. It contains a link farm with numerous external URLs, one of which is presented as a 'Kaspersky antivirus 2019 apk' download, suggesting a lure to trick users into downloading malware. The PDF structure itself is also flagged for containing a mass of external links, indicating a SEO link farm tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://baarspo.ru/123?utm_term=kaspersky+antivirus+2019+apk PDF link annotation
    • https://gerorajowivorem.weebly.com/uploads/1/3/4/6/134686153/dazomozajakokuv.pdfIn PDF document text
    • https://lavolobaned.weebly.com/uploads/1/3/0/7/130740571/rozivugesi-bemebuxoz.pdfIn PDF document text
    • https://dekimipuxaz.weebly.com/uploads/1/3/4/0/134016680/vuxazixe_logaret_rufer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495849/normal_5fe69e427e637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471710/normal_603d60fa0ef1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369305/normal_60bc1e8001cd4.pdfIn PDF document text
    • https://bopovajo.weebly.com/uploads/1/3/5/9/135966354/d4059eebb888411.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467306/normal_6027e91f10b6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446170/normal_60313cd298873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416326/normal_6039e55b6ebdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_6060fe3c45c1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445890/normal_604bc12793205.pdfIn PDF document text
    • https://wapilumavazari.weebly.com/uploads/1/3/4/4/134446451/bebod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413243/normal_601cff0f6eb3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365638/normal_5fdda4712a94a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a5702cc-0c68-4d4e-8c9b-b9735cbfdf66/the_crown_season_1_cast_mrs_churchill.pdfIn PDF document text
    • http://wotesova.pbworks.com/w/file/fetch/144801453/sikojitibotuzojexupup.pdfIn PDF document text
    • http://gitefov.pbworks.com/f/memanexexisevekaxovas.pdfIn PDF document text
    • http://sazupamufode.pbworks.com/w/file/fetch/144719274/69735331346.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d28332d-5fce-45ad-9a86-d56e143f438a/xipiweperozivisoxowimawal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f383e75c-b260-451d-8ac7-bdd57b5801a0/balance_sheet_format_examples.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8A 2988 bytes
SHA-256: 760c0a150663712d57d2c19c29010c8a75e3c366b291b85e6b756581d637c4ff
font_01_sfnt_off0000da27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA27 5456 bytes
SHA-256: 75e7d74c57e6798366f32d8ca470bae94fdc698ebaa6ad3d0aad6d4a549add86
font_02_sfnt_off0000ecd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD2 10900 bytes
SHA-256: 7d54ed35fad91a0fdee7df8850dcb3c4b16d13e15f2edd90964b079d3da692a3