Malicious PDF — malware analysis report

Static analysis result for SHA-256 7997cf54273a224b…

MALICIOUS

PDF

67.9 KB Created: 2021-02-22 19:11:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3a38770f4a8d57559d7b4e7a81b23579 SHA-1: bd4869bccaa7375a458745392ba6cef64a1fae5c SHA-256: 7997cf54273a224b309c253acbb05fd70a68866edf1d715f1408c12054b93af9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain elements related to the lure URL, suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://crophysi.ru/strik?utm_term=how+to+small+engine+carburetor+repair In PDF document text
    • http://magicwoolshop.com/komplikasi_ascariasisyu968.pdfIn PDF document text
    • https://nalokulomegeze.weebly.com/uploads/1/3/4/7/134758193/2479af3b.pdfIn PDF document text
    • https://nivagevap.weebly.com/uploads/1/3/1/4/131438423/mudiluj_ritodefuxesu.pdfIn PDF document text
    • http://fopafinegetob.iblogger.org/family_guy_imdb_parents_guide.pdfIn PDF document text
    • http://znakomstva69.space/910871510852h36g.pdfIn PDF document text
    • http://blaugrana.ru/cien_aos_de_soledadoomap.pdfIn PDF document text
    • http://price-list.moscow/big_arms_workout_routine74wtf.pdfIn PDF document text
    • http://prequester.online/zimopowevujovomazoxusasut6rry4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dutugege.epizy.com/carolina_panthers_news_bleacher_report.pdfIn PDF document text
    • http://noluboxemefosa.epizy.com/iphone_4s_back_button_app.pdfIn PDF document text
    • http://tuwafexom.epizy.com/android_studio_disable_adb_integration.pdfIn PDF document text
    • http://piretiwojof.epizy.com/purple_cowboy_wine_lcbo.pdfIn PDF document text
    • http://wedutatitupaze.epizy.com/snake_and_ladder_3d_mod.pdfIn PDF document text
    • http://ruzuzis.rf.gd/line_of_symmetry_worksheet_grade_4.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE24 5448 bytes
SHA-256: 2bf36c08427be0d0149cedde8b0bba4995c3ec970e14fe52528e9977840449c1
font_01_sfnt_off0000e0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 10028 bytes
SHA-256: 387589fc92735945535025dcdd48771add269e4350e2c80cf21adae82321f9fb

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