Malicious PDF — malware analysis report

Static analysis result for SHA-256 049801eef6cd5334…

MALICIOUS

PDF

70.1 KB Created: 2021-06-05 22:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 61a7a86dbb02eda1a0a794649e21ef24 SHA-1: 15915eddba304edf5477fc16ba663ca2cd9bbdbb SHA-256: 049801eef6cd53343c52058d579ad59bf2f6cba3537e4c57243b14088f477cad
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one pointing to 'smidgel.ru', a domain flagged as a link farm on disposable hosting. This suggests the PDF is designed to redirect users to potentially harmful websites, likely for phishing or malware delivery.

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 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://smidgel.ru/pbw?utm_term=the+chronicles+of+narnia+prince+caspian+book+review PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457005/normal_5ffb08f13c31f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4477637/normal_60b6608c2e38d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408991/normal_5ff4eaa7c002d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471484/normal_60495679d0474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470703/normal_6055dfde21920.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378170/normal_5ffc8bfeb98ed.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4505102/normal_60b2f7f914982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427538/normal_605f4686bf6a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426815/normal_6032ce6702b4c.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4470412/normal_60b1c8f831f7c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/screen_recorder_with_facecam_and_audio_video_editor_apk.pdfIn PDF document text
    • http://ritijix.pbworks.com/f/noduzipuvezaduvavinobop.pdfIn PDF document text
    • http://vakerul.pbworks.com/f/kuvap.pdfIn PDF document text
    • http://fisukafetif.pbworks.com/w/file/fetch/144417099/19011153192.pdfIn PDF document text
    • http://nuxawakaxaz.pbworks.com/f/76174113232.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/w/file/fetch/144661119/mewovofaxifanibopabojex.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/w/file/fetch/144464751/verixa.pdfIn PDF document text
    • http://ronefete.pbworks.com/w/file/fetch/144647616/blindspot_season_2_subtitles_subdl.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_off0000d65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65D 5408 bytes
SHA-256: c4e4c4c9f32108bb925803f137a30b006c10e2efed2310a090936888cacc9483
font_01_sfnt_off0000e8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CA 9928 bytes
SHA-256: f846a2487d8563d8f001d7bd1190dedcc5630adc527f5e07f85ebc82d4083d6d

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