Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd16761ec9a13cc…

MALICIOUS

PDF

76.4 KB Created: 2021-03-27 13:55:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 80642f877bf6653e0d7768f8badd0812 SHA-1: 9ed3ea579abc5eb2fdee48afa738a26640a2fd54 SHA-256: cdd16761ec9a13cc123143809ed5f93b96dc51e3b46ca1a397541ceeecf23ff5
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 0.9997

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://dugedepap.ru/strik?utm_term=what+are+the+3+gifts+of+magi PDF link annotation
    • https://cdn.sqhk.co/dukoredod/cpfidrk/34142988669.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/jOs2gh8/zegog.pdfIn PDF document text
    • http://wimixolumow.iblogger.org/burnout_game_for_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/niwexifa/fheZaCU/rulujuwibodidilelejuxino.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/b11168a7-c383-43ae-be00-2c3dec450216/jujekor.pdfIn PDF document text
    • http://xelidamos.epizy.com/business_thank_you_letter_format.pdfIn PDF document text
    • http://povalimokuwov.rf.gd/12593937263.pdfIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_d57bc4100a8d4f159e126c76d9f5cd9b.pdf?index=trueIn PDF document text
    • https://dd6f0c70-611b-430f-b219-ee0593fd0e1f.filesusr.com/ugd/d60051_016ca4b479e24b14956c06ea6a9023ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/what_is_the_difference_between_plot_and_storyline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/935d5db9-f385-42d3-92f2-a2c49dc63f76/fidasuzuwe.pdfIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_b9c33d5524eb477390d6e995b6e70445.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/midipes/cheadle_hulme_high_school_ofsted_report_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/wifukifi.pdfIn PDF document text
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_b3870c1028f64b9595ced66de2c022e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c119c28-1db6-4ed6-ad2a-aee7ee3a424c/66520713014.pdfIn PDF document text
    • https://4a7d9d2b-1d67-446c-8d6d-bdd3043d1f60.filesusr.com/ugd/c3d078_0852ca9b985e4093b435fa1a466bdbe6.pdf?index=trueIn PDF document text
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_69de088bcb8f4907a717a3b79d7ac511.pdf?index=trueIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_f333e1a557ee44bcb9346072573b3f38.pdf?index=trueIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_6913bb82791a4b819596734cc1fa2565.pdf?index=trueIn PDF document text
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_d910a153724342cd8992e1ed9762ac90.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_off0000eb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 5328 bytes
SHA-256: 6321e0ad69e73e816c328cf9e45440499be46b814ffc9fac664fed65651227ef
font_01_sfnt_off0000fd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 11660 bytes
SHA-256: 7a63bde3bbb24d824bc40090235a009a861824ac2390094ae5ffc0098c1ef5e5

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