Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc83f0deec2bc6af…

MALICIOUS

PDF

75.2 KB Created: 2021-04-01 00:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4284fd62b4cd8cc647509f14203486f1 SHA-1: 576ac6cfb32a0e96f8b1e95902f5248d7e172880 SHA-256: cc83f0deec2bc6af584295a03caee621c66f0035beb984c6e429a1e524e39006
134 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic firings indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The embedded JavaScript likely facilitates the redirection to the external URL found in the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xezojetit.ru/wix?keyword=how+to+get+rid+of+rats+in+attic+fast PDF link annotation
    • https://cdn.sqhk.co/zezetemirag/hS1vhiH/3749652610.pdfIn PDF document text
    • https://cdn.sqhk.co/wenejusuzixe/Yijhi4g/glory_road_cast_now.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422890/normal_5ff0340963264.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/ZGkFgjl/pay_to_promote_youtube_video_free.pdfIn PDF document text
    • http://voztrans.ru/8073455939ezlb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408583/normal_6059ca536bae4.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/iejVoie/web_for_instagram_firefox.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/OSgjghg/ancient_egyptian_history_books.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372104/normal_5fde670693609.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403806/normal_6037d9cfa911a.pdfIn PDF document text
    • http://vk-settings-change.online/ahirani_song_remix4ru33.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_1464fa06b4364120b89b2c8fb2cefe6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a409ea4a-7e82-43b9-afed-09246ef3f918/19280807505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48593f29-8cf5-4d72-9bd8-f4d1e3aec4ca/pathfinder_kingmaker_weapon_training.pdfIn PDF document text
    • https://07bd7893-a6ec-44d5-90fe-c719e602c0bd.filesusr.com/ugd/aafaff_a654447d23b842b4820160efc137ef09.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE446 5212 bytes
SHA-256: 3515ddb523d543a1c4cb8c1415eff4c855213e946beefd719ec826679c36ff6b
font_01_sfnt_off0000f626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 11616 bytes
SHA-256: 63fcdebea0ad994d7f669ea769ce35105caa182dbc0935b93d9d2d0d68d69b36

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