Malicious PDF — malware analysis report

Static analysis result for SHA-256 dabc0d65136d4139…

MALICIOUS

PDF

75.3 KB Created: 2021-03-18 01:31:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cecf1b39c28691d45b243b94bb531501 SHA-1: 70eea69f9f84ec84779a3409156cb93baaacc11e SHA-256: dabc0d65136d4139a2fc78d082dc8067522d63541906259eb2151f151d8d6638
244 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content or phish users. The presence of a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK and the ML_NYX_PDF_MALICIOUS flag strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to PDF files and application names, consistent with a document used to host external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://dafemum.ru/award?keyword=8+habit+from+effectiveness+to+greatness+pdf In PDF document text
    • http://matimomewojime.mypressonline.com/cours_d_amnagement_du_territoire_et_environnement.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/jvAa1By/boom_boom_football_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/hdtjchi/heartstart_hs1_replacement_battery.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/9jer4gj/best_space_trading_game_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_65c54d7d6d784276b4be936f9b0d0ac1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b176e45-3cd0-400a-b8bd-5d262a575b1f/photoshop_7_software_for_windows_10_free_download.pdfIn PDF document text
    • http://mawidinivetobi.myartsonline.com/beyond_the_wall_of_sleep_hp_lovecraft.pdfIn PDF document text
    • https://64e1471b-64f8-4582-b127-b1692805dd1b.filesusr.com/ugd/507a3d_d54a7d2061d94ec9888429fcb43f5164.pdf?index=trueIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_5f9f4e3bdd31488483ac6c714efa6aae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/65301369719.pdfIn PDF document text
    • http://xumuritikoxuk.myartsonline.com/70498152380.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/903b2f3e-9bdc-44e9-b4d0-f66db41c369b/marks_mechanical_engineers_handbook.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/29826847254.pdfIn PDF document text
    • https://3c45aaf8-24f3-4cde-9773-cf44a0a970d3.filesusr.com/ugd/ae7d54_2761574375ac4ce3a3675471e1924bbc.pdf?index=trueIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_9d096b4f509c4b3c89a08ad0e86d8ffc.pdf?index=trueIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_a436b960db7b420a982f69c99c42fb04.pdf?index=trueIn 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_off0000e66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66A 5836 bytes
SHA-256: bed3d86eb4f49f3ee4c1b69d3909f5933c70186085efb9cdad46061dd8bf2cb0
font_01_sfnt_off0000fa22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA22 11176 bytes
SHA-256: b3c4751650e9263ddd8eacef9e80a92375d8b96e990a7834f06108d3e63f87b5