Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea7d9d17446a54a…

MALICIOUS

PDF

79.0 KB Created: 2021-04-04 16:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: dd9686d0d9371a252adb93cbee8fec15 SHA-1: d6b55e508ddd57b7aeff0af90bc51fa144de766e SHA-256: cea7d9d17446a54a409921305563886b5441d7b9b81f511878c8a74069ad869f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, suggesting a link farm or SEO spamming operation. The presence of embedded URLs and the overall structure strongly suggest this document is designed to redirect users to malicious or spam content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://soxebez.ru/wix?keyword=ocean+circulation+and+currents+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/zidulibu/ieHjfhg/tusefu.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/57je9r3/sweeper_soccer_average_salary.pdfIn PDF document text
    • http://albl.ru/the_sword_of_summer_google_bookswqcol.pdfIn PDF document text
    • https://cdn.sqhk.co/fomeluxilim/k3Aknkj/92205188458.pdfIn PDF document text
    • http://bigwin-1xbet.fun/81514003440c1tz1.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/JtFgjji/77738656961.pdfIn PDF document text
    • https://cdn.sqhk.co/begokaxawip/idgeibt/windows_7_boot_manager.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/b1cec954-1c7f-40ba-9025-c8f600cb09b0/sirinavuwuwinek.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/43594852149.pdfIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_5b0a9babdd37490a8e46bbc5114992ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c0a69ea-6510-4286-a473-0877482831cd/how_to_find_original_photo_date.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/shell_script_command_line_arguments_check.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d9d7a22-5de9-4717-ae56-6bfc43ffda11/55323176710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6405a9e2-a132-459b-88e7-6cf7c8635324/orbit_hose_timer_wont_shut_off.pdfIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_903f773e783a4b769f25549faef0f80f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/177cd410-ee3f-47ed-ac2a-211acf217b78/porter_cable_18_scroll_saw_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/autocad_civil_3d_2010_software_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/21040049707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6998e8f7-6b05-46ef-9d1c-3989d8df84e9/5906334345.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/electrical_engineering_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/703fe147-9192-4fe8-ad08-dda961717275/87684899046.pdfIn PDF document text
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_050c4db8744e477eae1fc40ca0155e6b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5b45c00-34f4-4687-8a44-5b859c02246d/2nd_grade_books_for_reading_comprehension.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 3016 bytes
SHA-256: 07efd4b5ce35fe43d562a47bea6ca2be7e52a32f6dbf0d49a2a72276c44a66d1
font_01_sfnt_off0000f7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CB 5208 bytes
SHA-256: 80a17cf7cb8b64145383233338496fb7d37597c6b4684dbceb59852f773bc008
font_02_sfnt_off00010985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10985 10652 bytes
SHA-256: 6bf8e97472727f6b38a9b716e1cd6f6b78674213baad685f5aef17477a145452