Malicious PDF — malware analysis report

Static analysis result for SHA-256 86da43a752bb197e…

MALICIOUS

PDF

91.8 KB Created: 2020-12-16 20:46:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5660c583851cdce678804f54efdc104c SHA-1: 360dfc8fbc1317d7cb290fbdc40d2008b08ef9aa SHA-256: 86da43a752bb197e58d04afff80bbe131e374308446373d5d8157c31f7c764d3
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to known malicious redirectors or are part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/wb?keyword=aldus%20freehand%20free In PDF document text
    • https://static.s123-cdn-static.com/uploads/4417325/normal_5fcd182042ea6.pdfIn PDF document text
    • https://bulireta.weebly.com/uploads/1/3/4/7/134727307/8732453.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404976/normal_5fca4abf35070.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443594/normal_5fc999330dba0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493888/normal_5fccec67a33c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410731/normal_5f9744c403c57.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/59127990329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8412da2b-e221-4584-b417-a2ef94f1f691/spookys_jump_scare_mansion_hd_renovation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9183a021-3de3-498d-b875-858a2abb12c2/duvutesukeni.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc509327848ba205d335311/t/5fcbd7998dcc5603beff68b3/1607194524974/rojuretomim.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/american_lottery_application_form_2018.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc593df27a199023ad5232a/t/5fd1325c26a270047095f318/1607545436753/drive_simulator_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/33042619550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/913d9ebb-2afe-4740-aefe-93c229cc7e8f/dragon_ball_super_episode_111_englis.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/zewojupupajut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54ff160c-cd26-4c82-8d43-98991e363c9b/81154434126.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7F 4984 bytes
SHA-256: 5edc7a9a2d7ebe8454bf7eaf2cc08945f96902ef87ea5bcd88c97107b17b90c5
font_01_sfnt_off00012064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12064 13924 bytes
SHA-256: 0116b042be5055aaf8a687c2634aa90ab81a7baaf9bef92fde4110c409ee1f9d
font_02_sfnt_off00014bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC4 16060 bytes
SHA-256: 74c25351ceab73455d1891ea470fad3788f7d91d7dd2aa15ed54b0feca07d747

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