Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd234c11787b4d37…

MALICIOUS

PDF

78.3 KB Created: 2021-04-02 00:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: aa600e1c8b1df8dbcf84b197936a5712 SHA-1: 8f81a9326842450abb0e2b9e67706118967a2699 SHA-256: fd234c11787b4d37afb1c939a664506a84753cffd01a5efb18fd3cd2e4967108
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and is flagged by a machine learning classifier and ClamAV as malicious. The embedded URLs suggest a phishing or SEO spam campaign aiming to redirect users to potentially malicious content. No scripts were extracted, but the presence of numerous external links indicates a high likelihood of malicious redirection.

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 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://soxebez.ru/award?keyword=asme+section+viii+division+1+appendix+8+pdf PDF link annotation
    • https://cdn.sqhk.co/kenixidoxexi/cxvhgij/lesson_plan_layout_for_preschool.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462727/normal_5fcb667056a88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393016/normal_5ffc4783abead.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_605bb8e9ce4b7.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/23vs3jf/10026470982.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380411/normal_5fc88e77b2743.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/cwYBKX6/redirob.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/dhh4Jhd/virtual_race_appalachian_trail.pdfIn PDF document text
    • https://cdn.sqhk.co/wojidumezu/ge9ibYE/11634165111.pdfIn PDF document text
    • https://cdn.sqhk.co/liripudeb/hcjaS4N/facebook_tucson_marketplace_buy_and_sell.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383807/normal_6045c28b0475e.pdfIn PDF document text
    • https://cdn.sqhk.co/kixikeli/fgigGie/bournvita_ad_background_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478688/normal_601f30c50382a.pdfIn PDF document text
    • https://cdn.sqhk.co/nexoratuxi/73gvS7w/vofabovidunodilekogesujes.pdfIn PDF document text
    • https://cdn.sqhk.co/bukoxomule/hhcHial/taro_slush_bubble_tea_recipe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426966/normal_605bc9675921a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_20a25abdac0644399ab2a2723e611c8f.pdf?index=trueIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_f666457b29274465a971de2004d58ab7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9be50138-7493-4c29-a216-2ac9e6e1d7af/microeconometrics_using_stata_by_a._colin_cameron_and_pravin_k._trivedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3a516a5-48e9-4817-84ca-e14ef0eae06b/48696429938.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_off0000f528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 5536 bytes
SHA-256: 4ac83d1b2a34d339c07a92ac025c20d13c2088d0334d16e9dfb30d4bdf4467a4
font_01_sfnt_off00010802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10802 10536 bytes
SHA-256: dc3b336a2be53722eddcf5337aef21309a171ff98e25597c5b5323b5638fbf49

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