Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cfe3efe6b0ffcf3…

MALICIOUS

PDF

76.9 KB Created: 2021-06-10 11:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14e320003a450aa73ce3f45b4413615b SHA-1: 674e59eaeda2d337a7fb55dad5d3400bdfdd388d SHA-256: 9cfe3efe6b0ffcf352e05b635781d42dbf496881832fec2b4be6c8da17a8c165
164 Risk Score

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, with one URL pointing to a potentially malicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/pbw?utm_term=hard+and+soft+sound+of+c+and+g+worksheets
    • https://jedifubebevaze.weebly.com/uploads/1/3/4/8/134873515/5b99836b6787.pdf
    • https://fetatoba.weebly.com/uploads/1/3/4/6/134689412/8412530.pdf
    • https://giwizakewat.weebly.com/uploads/1/3/1/8/131857916/7327658.pdf
    • https://cdn-cms.f-static.net/uploads/4484097/normal_5fd389b988220.pdf
    • https://static.s123-cdn-static.com/uploads/4451028/normal_5ff4dc9e96ede.pdf
    • https://fuburufogukedez.weebly.com/uploads/1/3/0/7/130776130/1186102.pdf
    • https://gotumofavi.weebly.com/uploads/1/3/4/6/134602885/0d3484935ba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://savavaze.pbworks.com/w/file/fetch/144473133/gulf_of_tonkin_resolution_guiding_questions_answers.pdf
    • http://ronojew.pbworks.com/f/61664801891.pdf
    • http://lururefisu.pbworks.com/w/file/fetch/144570492/printable_reading_worksheets_for_kindergarten.pdf
    • https://uploads.strikinglycdn.com/files/d31ef074-111e-4a72-bd1f-8b716b2c9fb4/90525580011.pdf
    • https://uploads.strikinglycdn.com/files/9f7d7076-1624-4fec-bee1-a44a53153fcb/54299589851.pdf
    • https://uploads.strikinglycdn.com/files/9d327e44-c3aa-4015-b5b9-4c4c73db52b1/kidupuf.pdf
    • http://pagorevet.pbworks.com/w/file/fetch/144843351/download_dragon_rise_of_berk_mod_apk_terbaru.pdf
    • https://uploads.strikinglycdn.com/files/911bc3c5-94a4-42ee-9a89-d19868e257b6/crochet_for_dummies_youtube.pdf
    • https://uploads.strikinglycdn.com/files/13243397-3271-4451-8a20-e8ad20c8f65c/all_the_greek_gods_and_goddesses_names_and_what_they_do.pdf
    • http://lururefisu.pbworks.com/f/bl_theraja_volume_4.pdf
    • https://uploads.strikinglycdn.com/files/63d17a3b-75ca-4ef5-b98e-cdd26bf8b6b6/how_to_turn_on_segway_ninebot_max.pdf
    • https://uploads.strikinglycdn.com/files/e8e7940c-3bc7-4ab6-9923-ddce00f8a5cb/what_are_strengths_of_qualitative_research.pdf
    • http://lifelekufa.pbworks.com/w/file/fetch/144521496/evil_nun_1.4_3_outwitt_mod_apk_download_link.pdf
    • https://uploads.strikinglycdn.com/files/9470e0fb-a4d0-4e70-8ea3-90b473666d10/how_long_do_you_have_to_respond_to_interrogatories_in_california.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef5f.bin
d79e951e6b70d45c4fe272d26e9d750427ff5c68ec31b002986b14bccb6a33b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 5368 bytes
font_01_sfnt_off000101ae.bin
987e2c4416a502ac1aff9572bf2cbf980c2a88ac15b36385339734594b881a19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101AE 10108 bytes

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