Malicious PDF — malware analysis report

Static analysis result for SHA-256 282ac4a346a3cda6…

MALICIOUS

PDF

82.1 KB Created: 2021-05-08 03:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5a7bf44e675d513a7ac1f811f42761cc SHA-1: ce8435ac1a547762c7ec49d6b55abba2e488c271 SHA-256: 282ac4a346a3cda6fb17366c9c5e71e68f7bed04868a2f88af363ca5389cd08b
174 Risk Score

Malware Insights

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

This PDF document exhibits malicious characteristics, including multiple suspicious links to domains such as http://com-login8.xyz/salikizuyj2lr.pdf and https://ponafet.ru/strik. The presence of a visual download button lure and high ML classifier output further indicate a phishing or malware distribution attempt. The ClamAV detection as Pdf.Phishing.Trojan confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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.
  • 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://ponafet.ru/strik?utm_term=hp+probook+4530s+drivers+base+system+device PDF link annotation
    • http://reestr.site/18257668020vq21j.pdfIn PDF document text
    • http://com-login8.xyz/salikizuyj2lr.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/jflRljb/31134572461.pdfIn PDF document text
    • http://shoop-fp.ru/mexujuvibujuxivur59so.pdfIn PDF document text
    • http://magazok.top/xoderugabugosetuxonea7i5d.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/3jghaUp/truck_backing_up_games_on_steam.pdfIn PDF document text
    • http://prostotit.site/double_dapple_miniature_dachshunds_for_saleura0v.pdfIn PDF document text
    • http://visionnew.xyz/marlin_60_ss_laminate_for_salevmeue.pdfIn PDF document text
    • http://organicsss.space/99374206107g5ygw.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/0b629b7c-928e-4c1c-b688-269ab4de62b8/kenmore_dryer_repair_kit.pdfIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_b89b270eb4ff471599a041babb10e58e.pdf?index=trueIn PDF document text
    • https://99d0733d-4d0e-4d19-b238-fea6f81017ca.filesusr.com/ugd/e32e4a_92551e6a26c44a9e8faefd8b7cef6c41.pdf?index=trueIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_bd189c89ae5b418c9b3a3c8d8a2d10d4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a0ac2e7-5984-4da9-b7c8-ce4c7d1abac3/nofawuzuvibatoxepop.pdfIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_8ab0c832416b4a67a4bec95f649aa1ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/683924fd-0966-4bd3-b05e-c7cd4c61ef55/97048336621.pdfIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_6ceda0264a8d4b16a84b5f6b4b1c8290.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f89a0fc-323b-41f2-b01e-dee81011f0bb/zefizasufowifi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7F 6032 bytes
SHA-256: 83b1987b9603868d130f8b9e024b21e582d4392d03e4f3156dd1427372aa6720
font_01_sfnt_off00011407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11407 11024 bytes
SHA-256: c1d07d3c7ef7eeb36c9a79aa8939a3154cafafece1942c89d40cc5b8f59c1ba5