Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d71a12ba54f5137…

MALICIOUS

PDF

75.7 KB Created: 2021-04-01 05:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d84f9257bcf2829b6b3495f10faf2348 SHA-1: 1f6be1b1d05d414303bfdc011a76d32b5184fd27 SHA-256: 8d71a12ba54f51372bbd098513011312f9508270a1db1cdef22a09ef0ae3f92c
142 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a deceptive lure related to search results, likely intended to trick users into downloading a malicious payload from one of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jacksth.ru/award?keyword=mackenzie+english+for+business+studies+cambridge+pdf PDF link annotation
    • http://revadadijavu.22web.org/periodic_table_worksheet_year_8.pdfIn PDF document text
    • http://rowomonug.mywebcommunity.org/is_classical_guitar_easier_than_acoustic.pdfIn PDF document text
    • http://gogejevi.iblogger.org/outlander_diana_gabaldon_show.pdfIn PDF document text
    • http://zarabatyivat.ru/outdoor_survival_knife_kit7vw8j.pdfIn PDF document text
    • http://movigakamemik.22web.org/befele.pdfIn PDF document text
    • http://xokebidukefu.getenjoyment.net/entrepreneurship_class_12.pdfIn PDF document text
    • http://resimpub.com/71205178782f66ka.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/ngjPgiz/simowamolid.pdfIn PDF document text
    • http://dedaruk.scienceontheweb.net/szck_trleri_test.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/uchiage_hanabi_sheet_music_violinh1c31.pdfIn PDF document text
    • http://vumexovuvelafe.medianewsonline.com/wivazigenobijokowuvibire.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/aicrhiL/dragon_arena_lords_mobile_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/zikonidenijo/shhEshd/red_ball_4_unblocked_6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xefujifivifizu.epizy.com/4017314763.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_2545d0807c564bfa8530c6f52ac054b1.pdf?index=trueIn PDF document text
    • https://63c031ef-a76e-4574-b6c7-b683c5cdde0f.filesusr.com/ugd/3a5e7a_8f739a2da60d412095851ca9e091c99b.pdf?index=trueIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_2ae196736a7b4638a3accd29d5d8b8b5.pdf?index=trueIn PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_3407adb2d33842729cae88f534daceae.pdf?index=trueIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_ff5187432fbf4c0f84032609d4139b51.pdf?index=trueIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_c2079dbf7055462d9c8532b1bce750ab.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD057 5828 bytes
SHA-256: 0bd243fcc319e4bb71643e6be4627c87f32a222caeb825cb410967384d987f88
font_01_sfnt_off0000e412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE412 11600 bytes
SHA-256: 7c076f0f67c648726d18a326aa16c36eb382c7419a4b567708b9874269fec01b
font_02_sfnt_off00010a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A21 16140 bytes
SHA-256: 1ffca1ef16be5e2ec436e77f9211a88ad3199dc781cb76600401cc2e2c7dce6d

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