Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc6e8f8b68b8e7a…

MALICIOUS

PDF

116.5 KB Created: 2021-04-01 23:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 717af8d0db4fa9164dfb20200d67a2b0 SHA-1: f0751ef81bf5306d3bd75b132b5e1f295f15138a SHA-256: dcc6e8f8b68b8e7a2acf4ae5dd0a170cbd3d56f3b4bb807adf7ba3ae90f6e003
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

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 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://jacksth.ru/strik?utm_term=the+summary+of+animal+farm+novel PDF link annotation
    • https://cdn.sqhk.co/mipijotom/vjiUjdc/61865603750.pdfIn PDF document text
    • http://auth02mobility.com/nasopdi6i5.pdfIn PDF document text
    • https://cdn.sqhk.co/xesagomi/Siiidhh/36537319962.pdfIn PDF document text
    • http://masajsalonunuz.com/10581502303th7yu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392861/normal_60129788d0f8b.pdfIn PDF document text
    • http://verifybadgesbusiness.com/form_c_submission_deadline_malaysia2nxei.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/3421011456801ace.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383586/normal_5fcede45f108e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452608/normal_601d26ce71051.pdfIn PDF document text
    • https://cdn.sqhk.co/gegefemorosu/jjoiP8W/23151763730.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454161/normal_5ffed3f2eaae3.pdfIn PDF document text
    • http://blubadgehelp.net/33172918188uayoh.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/cinquenta_tons_de_liberdade_grey.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393790/normal_5fe8dbb2d0691.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/1hhjiie/crowd_city_2_game_download.pdfIn PDF document text
    • http://new-volosi.ru/mififejiguniroikkth.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/liberation_theology_in_africa39ttp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_6576790592d24d62b77c55ec42a94e10.pdf?index=trueIn PDF document text
    • http://madigekole.onlinewebshop.net/occupational_safety_and_health_act_1970.pdfIn PDF document text
    • https://fb075467-9d00-46c6-93ac-2b777f5e584b.filesusr.com/ugd/8bcd66_f18fd1ae677146bbb82aeae98567e2b4.pdf?index=trueIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_798296dad564435d82525c36474c6b88.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_off00018b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B2F 5116 bytes
SHA-256: c420a840c9b5bf21e5ab553ee0c3515b521e17203e41730567361fb9e6bb1284
font_01_sfnt_off00019c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C75 12080 bytes
SHA-256: 8b570dd8f00e7897b3ad5d53913a9c1315bf5a200749e5fd5c3530e5c4f14133

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