Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3bc0533593c56f1…

MALICIOUS

PDF

78.2 KB Created: 2021-05-19 04:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8f9c585735b940f654bf9d66692c53cf SHA-1: b972be78fed3a23204c780d959b331dd62ca1db2 SHA-256: e3bc0533593c56f1d506814a7c23fcc8e3ceecbeca3c70f5ced88753880fdaa8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://golowaki.ru/strik?utm_term=fall+guys+ps4+discount+code+uk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481166/normal_5fcc39172679a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376625/normal_603856eb37af8.pdfIn PDF document text
    • http://gulebamabixaku.22web.org/bahubali_songs_mp4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_60290958b9769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370288/normal_603079e0209ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367648/normal_601dd30f3067c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481058/normal_5feba041bd287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444100/normal_6033f71a738fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420441/normal_606628093d3df.pdfIn PDF document text
    • http://kilagine.22web.org/32387607698.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/676a7a2b-0ead-420c-b72f-32d284170312/learning_arabic_online_free_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/39964526384.pdfIn PDF document text
    • http://zutulig.epizy.com/mangala_sutta.pdfIn PDF document text
    • http://lizusesujujes.rf.gd/bofibowazolofuza.pdfIn PDF document text
    • http://wisorak.epizy.com/aashto_lrfd_2020_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66e130b0-3f6a-454e-a0c2-d74217f15918/un_curso_de_milagros_leccion_20.pdfIn PDF document text
    • http://ferodokibaw.epizy.com/factotum_90_achievement_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/sheriff_of_nottingham_game.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/english_grammar_check_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/10183435593.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_off0000f10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 5356 bytes
SHA-256: 04dead9874a98fe1aa9c8aae0eef1196e9fd98fe7d123493e6629b941b499d56
font_01_sfnt_off0001036f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036F 11820 bytes
SHA-256: 1718b7f36a616c232ecfa9ba052699b5024cdf76c599e30ec2b210baafd45bf1

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