Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca692dc9a10b5a8c…

MALICIOUS

PDF

80.9 KB Created: 2021-03-28 22:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 43048490c744e769cd7ae4804f10cd77 SHA-1: ec7f4d54f527f4ae05693c0a27adf26b51201ee0 SHA-256: ca692dc9a10b5a8c8c9637c50984b281af6a288ab2e833a2b7bf7cb27f4a34e6
156 Risk Score

Malware Insights

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

The sample is a PDF file that contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. Multiple security tools, including ClamAV and an ML classifier, have flagged this file as malicious. The presence of numerous external links suggests a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://botokaw.ru/strik?utm_term=the+forever+war+dexter+filkins+sparknotes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426697/normal_60533a37b5053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485935/normal_602d39d1414b1.pdfIn PDF document text
    • http://wopedejani.iblogger.org/eaton_fuller_8ll_manual_transmission.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465003/normal_605c1abb1268f.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://fakupomajokiwe.rf.gd/dotiberefir.pdfIn PDF document text
    • http://morufigalolo.rf.gd/time_table_template_html.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/audio_visual_method_of_teaching_english.pdfIn PDF document text
    • https://abe99a74-823b-4c5d-85d6-f8d8de52422f.filesusr.com/ugd/73cc63_aa7a822f34974892aa9f4086d80b25fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/pejokimetigomukabad.pdfIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_11cd8daeb7f849948cc633e3f5cf9bce.pdf?index=trueIn PDF document text
    • https://023e3b0e-89aa-4e00-bd19-175c11a0a9c0.filesusr.com/ugd/5f4883_d10bf00a5de649228ab6c0b4ac003486.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dagasopones/how_do_i_connect_my_hp_deskjet_f4580_to_wireless_network.pdfIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_30c59690f8f34b3fb1aa8a95b93647a4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/carrier_ac_remote_control.pdfIn PDF document text
    • http://mugekalamiwatek.epizy.com/33056983462.pdfIn PDF document text
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_3c867938d955424c9d2f044516abc547.pdf?index=trueIn PDF document text
    • http://vezuxafafifobo.epizy.com/kosasal.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/82668720366.pdfIn PDF document text
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_a5a4a1ce40df42aaae9e07ab58771930.pdf?index=trueIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_5d934e5186eb477584802bd894024808.pdf?index=trueIn 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_off0000eed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 5152 bytes
SHA-256: 0dd8600e382941f954945ffc9eb4868f2dba567db0093bd02dede0557004c2a5
font_01_sfnt_off00010064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 11160 bytes
SHA-256: 532223d760ef5c37059306780710a8dd5235d6ecc5bc0c0693f83ba02df23225
font_02_sfnt_off00012616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12616 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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