Malicious PDF — malware analysis report

Static analysis result for SHA-256 0358956b540726fe…

MALICIOUS

PDF

80.8 KB Created: 2021-02-16 19:09:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 346a478a2eee179b67607473312ec6c0 SHA-1: 7a6cad18e5dd2a0835ec3e733c5d6f879aa793b3 SHA-256: 0358956b540726fed57004a92345a153b5b47002632f4201cf96a7a690a09c11
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for malware distribution and phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/wix?keyword=forensic+anthropology+webquest+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/toneribabut/dic4Xje/great_horse_farm_names.pdfIn PDF document text
    • http://plusstore.pro/jixalerekuxufidaxubobamoubqn2.pdfIn PDF document text
    • https://cdn.sqhk.co/fezusife/P0GBoid/dodiwotokobaverewux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366366/normal_5ff8dd9c69586.pdfIn PDF document text
    • http://stnold.com/20303428603tbsf1.pdfIn PDF document text
    • http://pushbiz.fun/venif585fi.pdfIn PDF document text
    • http://xegafutulon.iblogger.org/is_there_an_app_that_can_scan_barcodes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490375/normal_602a4175c342b.pdfIn PDF document text
    • http://gitipakivo.iblogger.org/mcafee_antivirus_online_installer_free.pdfIn PDF document text
    • https://cdn.sqhk.co/dejijadu/y3wBjgq/mufutupine.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/ejjiehh/parrot_voice_recorder_download.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lirinuguwe.rf.gd/brindisi_report_incidente_ferroviario.pdfIn PDF document text
    • http://kaxafedi.epizy.com/67371232335.pdfIn PDF document text
    • http://mivazofirogo.epizy.com/lagu_asking_alexandria_alerion_full.pdfIn PDF document text
    • http://xinasewaja.epizy.com/peronuxidowoxotowoz.pdfIn PDF document text
    • http://binasizula.rf.gd/online_housing_application_form_birmingham.pdfIn PDF document text
    • http://nafuleleg.epizy.com/63001011292.pdfIn PDF document text
    • http://mowadavukusut.epizy.com/faxonosu.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000109fd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x109FD 23216 bytes
SHA-256: f71e206aee217fddb11545c7c7ab0d42c60b595f5acbbb3038166bf2747413d6
font_00_sfnt_off0000cbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEA 1684 bytes
SHA-256: 4d3fb6748bdbfc0676bbc246a341b567ec3707c335db72ae26270b639488ab50
font_01_sfnt_off0000d44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44E 5672 bytes
SHA-256: 2127f761d02c571293f656e2ebb02d94068129c87765a82a904fd6f42ef24c08
font_02_sfnt_off0000e7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AE 9968 bytes
SHA-256: 1beb49670881ed554f24f072a646938baf8217ae640e9a4cacfd39ee92ee0a80

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