Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b16b5994bfccd1…

MALICIOUS

PDF

107.4 KB Created: 2021-04-27 22:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 30ddb9eda85f7e89fc371da79bd27de6 SHA-1: 2e0a23d7abceeb9222337f359418b7ec91e756c5 SHA-256: 87b16b5994bfccd1d01911847fde69d211d5ab4b61602df21403f64981b3137e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://soxebez.ru/strik?utm_term=1662+book+of+common+prayer+modern+english PDF link annotation
    • https://gosupafitowiru.weebly.com/uploads/1/3/4/6/134673249/jokowaw_noxep.pdfIn PDF document text
    • https://sasikivi.weebly.com/uploads/1/3/4/4/134462450/labekufu.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://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_3ce72927a0f14150bf6849af4cf9123d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/why_wont_my_slim_folio_keyboard_work.pdfIn PDF document text
    • https://b9ecad59-ee1c-469f-8402-ddbad3bf215f.filesusr.com/ugd/84dab8_4f21908e5f4546b3bdac03898b40c10f.pdf?index=trueIn PDF document text
    • http://zobagef.epizy.com/zanut.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/sass_bootstrap_sample_template.pdfIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_996c36650b514e79a79c3278f9681c93.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b522a69-0c42-4660-9aad-7fee8f07d0c1/how_to_adjust_zoom_audio_settings_on_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17d0449d-9d89-4012-a50e-7b3cb1cd6b67/kojazajireganofapaviv.pdfIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_7d9000358ec844a3bf93b28bf5091315.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/11645869284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2595529-163c-4fc4-a7be-c239d2c83e3c/77936509177.pdfIn PDF document text
    • https://6f29901e-f5c9-4775-879c-97b2de5c8d5b.filesusr.com/ugd/0bf195_0257f74f5c7240569119f0f1d19166a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/93087402925.pdfIn PDF document text
    • http://zutotakome.epizy.com/times_tables_sheets_to_print_free.pdfIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_fddf7c70b2dd4737afc5f8e2259b5622.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aad6e2a-7c10-4451-8fd4-8ff753ddfd66/wazuwududesefopolaxi.pdfIn PDF document text
    • https://67536400-2f23-40e2-9d3a-36ae3f4dfb8c.filesusr.com/ugd/5312ea_196120a97aba470b99f6c0b121136cc2.pdf?index=trueIn PDF document text
    • http://vorofij.epizy.com/52973782588.pdfIn PDF document text
    • https://7c50ec62-1ece-451b-b03c-4788199016cf.filesusr.com/ugd/635f3c_b9426df264ea4a3ea179e52908e1ea66.pdf?index=trueIn PDF document text
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_0209f8229dac4b81a0255f0a49a03b7f.pdf?index=trueIn 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_off000155ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155ED 5824 bytes
SHA-256: 39c736c505679e88344a707c48615dbe84226d170e1d11bba7d232cbf5d47c40
font_01_sfnt_off00016981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16981 11792 bytes
SHA-256: 24add62dceaa366f9de7e2eff60caa408c54deadd0e73aa374065e6a555aa062
font_02_sfnt_off00019162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19162 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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