Malicious PDF — malware analysis report

Static analysis result for SHA-256 651ac8cb76dc74bc…

MALICIOUS

PDF

95.3 KB Created: 2021-04-09 02:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ce796e6ab9b47470588b91acc90164b6 SHA-1: 58b5509cfa910bbeea67c045f71fb3ea22e43a82 SHA-256: 651ac8cb76dc74bc7cc460c2a62504360d51f3f349074f93d5237e9f97ce3313
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://nipisod.ru/strik?utm_term=plato+five+dialogues+apology+sparknotes PDF link annotation
    • http://trikolor.site/sap_abap_eclipsez5tac.pdfIn PDF document text
    • http://0fruits.space/cb_background_hd_2018_zip_fileqgmrb.pdfIn PDF document text
    • http://idealica-italiaoficial.site/58209599035nnk8w.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/zuludaxefepolepidim1n1hh.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/djjheMq/50392993155.pdfIn PDF document text
    • http://creamspait.xyz/89665427554asbkj.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeform.com/63627228607vpnqe.pdfIn PDF document text
    • http://igme.site/mobawepametuzactf00.pdfIn PDF document text
    • http://bupro.asia/wopofamopomejatufpovl.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwonukunav/PhgEs2u/tic_tac_toe_game_java_swing.pdfIn PDF document text
    • http://ruzamaji.getenjoyment.net/dupematugejowabiweripo.pdfIn PDF document text
    • http://freud.icu/17029277710kv71h.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/92ae7cec-4a91-4e57-86e0-1dfca80a454a/xanes.pdfIn PDF document text
    • http://kofepiropi.onlinewebshop.net/life_application_study_bible_kjv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9437326b-5912-4b54-9392-4237cd2f1249/were_humans_meant_to_eat_grains.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ca41854-5e2f-4372-bb37-5987627c4e67/27316180952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2418db53-54be-4846-a825-ee7fd0a85c2b/win_7_set_auto_login.pdfIn PDF document text
    • http://sanugifop.atwebpages.com/vedobusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78f48d99-0cca-4fe7-af66-9a81338f21fc/jinugatufomeferetase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a587c809-d01e-4be2-ac9d-eb4e13440f7d/7669963102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85330ace-ac5a-4815-bbe6-b0842330cd92/kaxaf.pdfIn PDF document text
    • http://senawoxagijajo.onlinewebshop.net/90459525715.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_off00013045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13045 5436 bytes
SHA-256: 43a9415b24aadc220684b1c3e3ed1e03c14055ea8671ccbdef96783c5a941bef
font_01_sfnt_off000142ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142ED 13680 bytes
SHA-256: 332740b2e0c50b40da6824137483ba4afcea2f821c563f04bb18e334ca8e3b3a

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