Malicious PDF — malware analysis report

Static analysis result for SHA-256 da75416a9fb85e81…

MALICIOUS

PDF

76.2 KB Created: 2021-05-16 08:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 316798711fd6ba0c0206d81914b9019a SHA-1: 331db59137b456fa3807747dc527b834632e4d3f SHA-256: da75416a9fb85e818daad7aa14d90fd17edd6249862114394947e13f4a1b9cba
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, suggests a lure related to search results or product comparisons, aiming to trick the user into clicking a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/strik?utm_term=is+garmin+s20+better+than+s10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393791/normal_6057b8f62f365.pdfIn PDF document text
    • http://uscarins.info/16630945442109c9.pdfIn PDF document text
    • http://dujoxizuzepofom.iblogger.org/veragip.pdfIn PDF document text
    • http://vovpomnim.ru/vizontele_indir_tek_link96mxk.pdfIn PDF document text
    • http://pagebake.com/sozozisevubilufuwokoriium7g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413112/normal_60269443eb5c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473322/normal_5ff38f135b82a.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/95f06f65-4e0a-40e8-bbf3-96269ce3a5eb/berserk_manga_volume_13.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/304d479d-80b7-419f-bfbb-5cee32b7d147/45628725641.pdfIn PDF document text
    • http://mapureju.epizy.com/53528131257.pdfIn PDF document text
    • http://jovifididapop.epizy.com/nedakimumeta.pdfIn PDF document text
    • http://jufotafilowor.rf.gd/18208531964.pdfIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_41e6ce5d52fb47c3b2e922e855a56239.pdf?index=trueIn PDF document text
    • http://tunifowu.epizy.com/apache_tomcat_interview_questions_and_answers_download.pdfIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_430d491012db4d03b8558bf29dfc913c.pdf?index=trueIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_684e28b367274bb8b153d711a0794ae9.pdf?index=trueIn PDF document text
    • http://koriwiginajefet.epizy.com/livonube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54ab7763-fa0f-4eb9-b0da-243a1ec77ac8/fefurip.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_off0000ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 5472 bytes
SHA-256: 366a174f5243f941344db0824b161d97d265149fe57f4c59f159599ff27bc263
font_01_sfnt_off0000fef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 10348 bytes
SHA-256: f6d083f0bd4e809f63f6790e55e55ad941e80c6e364cab6a0337fadca09d983e

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