Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7f91ce36df2885…

MALICIOUS

PDF

83.2 KB Created: 2021-06-05 12:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 791c0be97ac818f559be0bf3fb9ff134 SHA-1: edebeac211989fce4a52085fa31c0f755cbeafee SHA-256: 8f7f91ce36df2885efb8f16dfbf589655db7c9baed68705f069f25a1bdc615ef
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious sites.

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
  • 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.
  • 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://botokaw.ru/123?utm_term=abcd+movie+all+ringtone PDF link annotation
    • https://xekexudaxojow.weebly.com/uploads/1/3/4/3/134365032/kupitalatifalu-xugerok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454438/normal_602fdedddb2b4.pdfIn PDF document text
    • https://wilalunawotepa.weebly.com/uploads/1/3/4/6/134608105/mexulaxonokowimudoju.pdfIn PDF document text
    • https://guxodobozit.weebly.com/uploads/1/3/4/3/134333536/xisofiwufikiwak_felatab.pdfIn PDF document text
    • https://ximuwiwafit.weebly.com/uploads/1/3/4/8/134851464/3504646.pdfIn PDF document text
    • https://mixirarorasuju.weebly.com/uploads/1/3/4/3/134317495/saboka_rumupo_dopoziwape.pdfIn PDF document text
    • https://buvujufa.weebly.com/uploads/1/3/1/3/131379824/15c65b.pdfIn PDF document text
    • https://migaxodilex.weebly.com/uploads/1/3/4/8/134852634/molopazu-tugilotidutop-fanaxavebinesu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413986/normal_5fe27d7cd43a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427509/normal_5fdfc7229ee43.pdfIn PDF document text
    • https://bamopinusomuna.weebly.com/uploads/1/3/1/3/131379567/gevojosofew.pdfIn PDF document text
    • https://winulovovitazu.weebly.com/uploads/1/3/0/7/130740324/likalilan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422136/normal_6069775a8170f.pdfIn PDF document text
    • https://vogitoroxubas.weebly.com/uploads/1/3/0/7/130739894/2226398.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/bfb97d75-ab35-4fbc-99e3-21e0bf7d8a7b/what_does_the_term_jelly_belly_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d9b3f4f-4261-4a2a-91c1-99159f34c83b/35363160003.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20d8aad5-92dd-4fbb-b363-0fa52b65ef5c/how_to_run_python_scripts_in_windows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/001a4b81-70b1-45b7-8988-999cfb452789/fuzurimeduvuvubudinizoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2031f56e-ee9c-4db9-81bb-152b12f5672c/ap_statistics_barrons_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cb5f948-a915-46e6-bf0d-71cc0c6bdc39/python_enumerate_list_in_reverse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10a042d7-8ae8-441a-9d6f-1488941d3f62/kidde_kn-cosm-iba_hardwire_combination_smoke_carbon_monoxide_alarm_with_battery_backup.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 5056 bytes
SHA-256: a6791759110316383246651be7e9c021f3eb4d11d3d4b96949a2075befc7b953
font_01_sfnt_off00010d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5F 10368 bytes
SHA-256: 9968e258c53cb32d1783f2afbaaf787ce5bf6891458f0765c754c376f1326477
font_02_sfnt_off00013101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13101 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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