Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc909d733e57a8c2…

MALICIOUS

PDF

75.9 KB Created: 2021-03-03 11:00:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 07ea1d0a1877e07d0d32ac7d668d8353 SHA-1: d4db55445ed898aaccd6183be0d320ec109d6edf SHA-256: cc909d733e57a8c20ad9a9de541d1c201254555d68060045e9509e918f0d0dee
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with at least two pointing to suspicious domains ('pelibifir.ru' and 'wedipum.mygamesonline.org'). The document body, though heavily obfuscated, appears to mimic a search result for 'covid cases', suggesting a social engineering lure to encourage clicking on the embedded links.

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://pelibifir.ru/strik?utm_term=how+many+covid+cases+in+maine+today PDF link annotation
    • http://wedipum.mygamesonline.org/i_hope_you_will_be_fine_meaning_in_hindi.pdfIn PDF document text
    • http://kujamemapevubu.mypressonline.com/life_as_a_peasant_during_the_middle_ages.pdfIn PDF document text
    • http://ludirobus.getenjoyment.net/45766258817.pdfIn PDF document text
    • http://tejidirexe.mywebcommunity.org/vujuxeweginiguka.pdfIn PDF document text
    • http://piwulag.sportsontheweb.net/what_is_the_central_theme_of_we_wear_the_mask.pdfIn PDF document text
    • https://cdn.sqhk.co/tamikoveken/SdkAKVc/onedrive_password_manager.pdfIn PDF document text
    • http://fafesixokegigi.getenjoyment.net/14621175245.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nowokil/hp_envelope_printing_template.pdfIn PDF document text
    • http://widepidaba.atwebpages.com/39662421472.pdfIn PDF document text
    • http://bakutogigu.rf.gd/43817030791.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/xavazokewaxegogotan.pdfIn PDF document text
    • http://repafow.epizy.com/xomasobazovegegofewo.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/apache_tomcat_8_filehippo.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/ejemplo_de_un_guion_teatral_muy_corto_para_nios.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_off0000ed0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0B 5172 bytes
SHA-256: deacd34e6254c8bfab9a3cb66200886d92f98018c5e5b22af164cbb37abf973d
font_01_sfnt_off0000feac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAC 10516 bytes
SHA-256: 338389c1ab8d4a72fca5c827f312a5c280b377e0c3016d505b72a07965552793

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