Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf12ee83924f30d…

MALICIOUS

PDF

78.2 KB Created: 2021-03-14 19:13:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f35927f2619b1ca473fe098ae07ec2b0 SHA-1: e6a0de34f466feff5e5b7efad54946a0881203a5 SHA-256: fbf12ee83924f30ddecf53b961f69b7084427f66af5fe5dc093d89adb4b159e7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in SEO poisoning or link farm attacks to disguise malicious content. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan payload. The embedded URLs, such as http://kdghy.online/70329900328n7ber.pdf, are likely part of the attack chain to deliver the final payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/award?keyword=play+winning+chess+book+pdf
    • http://kdghy.online/70329900328n7ber.pdf
    • http://twitter-center.com/87687175591qbwyd.pdf
    • http://vanlit.ru/kusofakexigimipuvewajuws5a9.pdf
    • http://trokot-roznica.xyz/xusozaliguxipuregewadotejre8u.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_b8cb7b3b09354106ac4bc615d6a2e20d.pdf?index=true
    • http://wewamamewiler.atwebpages.com/knowing_god_s_will.pdf
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_8652b0463cbb434d848ebd170aa4c269.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e7494d22-489a-4b13-912b-b72aec96df9f/does_jojo_get_a_stand.pdf
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_099d36bfa5df4bb59a17d987e409b969.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fd6f1268-e268-4bfb-90f9-8e11321a6f48/citizen_navihawk_blue_angels_worldtime_c300-q00842.pdf
    • https://uploads.strikinglycdn.com/files/db45bfd6-67ea-498c-845a-3378568315b6/91324291910.pdf
    • https://uploads.strikinglycdn.com/files/cc45b838-d897-4a40-a0c9-d7b208bbbab7/21758640592.pdf
    • https://uploads.strikinglycdn.com/files/8a54cdaa-314c-4761-bc89-6743fbacbd0a/39456980121.pdf
    • https://uploads.strikinglycdn.com/files/8f17b128-6464-4ffe-bc70-6ac0433324c0/99161582726.pdf
    • https://b8e64ff8-a522-4625-8e91-70fe47930cb2.filesusr.com/ugd/37987b_4342611755064e2eb11a7baf23831852.pdf?index=true
    • http://tiluxusimutine.atwebpages.com/best_sci_fi_fantasy_books_on_audible.pdf
    • https://uploads.strikinglycdn.com/files/81323479-29e7-43fa-8599-d34a1f164c36/dugaterokabitid.pdf
    • https://uploads.strikinglycdn.com/files/efcbda26-22f3-4c5d-b717-d0f3760712d0/what_size_battery_for_walgreens_thermometer.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e723.bin
fe33a9a6dd3d08502df27d954d6608fe9c6b2d9c99f70591462e200c0c99d7e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 5428 bytes
font_01_sfnt_off0000f992.bin
6acf86e2a59e0e5bb2eb555a4d445de2932ea71a86d545430bb0acf49e3c5636		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 10636 bytes
font_02_sfnt_off00011db8.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB8 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.