Malicious PDF — malware analysis report

Static analysis result for SHA-256 88cef0624f8da027…

MALICIOUS

PDF

79.6 KB Created: 2021-03-21 06:36:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9d1327df140a58c875a5aaf26c67cd38 SHA-1: 151558c39af4c43c8f9d680a685e74698801df64 SHA-256: 88cef0624f8da027c4aae82df983bf2a445633cd5d09126b592d6169e1bc1f1f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, including one pointing to 'soxebez.ru', which is indicative of a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains references to 'Fallout 4' and 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. No scripts were extracted, but the PDF structure itself is leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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/wix?keyword=fallout+4+step+ini PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416502/normal_602d98659fe99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_6048db92765f1.pdfIn PDF document text
    • http://reduslim-ufficiale.website/749051191148ykyj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501479/normal_5fc8421acc260.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415526/normal_5fe82c1676297.pdfIn PDF document text
    • http://torchqbfl.fun/ccc_registration_form_downloaden6xr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466996/normal_604ce23487d32.pdfIn PDF document text
    • http://net-klientov.ru/corrugated_sheet_metal_thermal_conductivity1dau3.pdfIn PDF document text
    • http://urott-hu.com/kuvonekokozinazogove77cb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444374/normal_605156ada6d8d.pdfIn PDF document text
    • http://d2-club.ru/94191627345u07wn.pdfIn PDF document text
    • http://wopebexe.66ghz.com/92177152851.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425726/normal_602c333c5b75b.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/6558af80-b29d-470b-bd50-80c34ce34624/73066201886.pdfIn PDF document text
    • http://nodibuxirojijok.epizy.com/xebudiweg.pdfIn PDF document text
    • https://1580f21e-fc75-4350-9669-3be8b7525729.filesusr.com/ugd/eff6cf_99cb75ce6c7c46988bb3753b1b379db7.pdf?index=trueIn PDF document text
    • http://xuzujokavagud.epizy.com/4241463523.pdfIn PDF document text
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_5d7917a6d52d460fb1e326dc47c6d7ac.pdf?index=trueIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_6b0a597c6ac84725aef94ef5c11369fa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e19c7af1-16d3-4d71-9671-cebdcee796be/sumawopesinipesebexedup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/739f33f7-996c-49c3-9b98-3f9f1cf8ea65/what_is_italian_for_woe_is_means_in_bible.pdfIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_e54d9a004b314c82b0befe9668fab936.pdf?index=trueIn PDF document text
    • https://5b0ea1c3-b874-41d5-a3cc-49595beb80a6.filesusr.com/ugd/0c63be_5716aebaad7f48e7841e785321df3975.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF940 4760 bytes
SHA-256: e32bfb4aa2033b8dee23df2dab9aca87ffc7fbcc6a830dedca4b537e85d9a4ad
font_01_sfnt_off0001098c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098C 11192 bytes
SHA-256: 9601672d6536773df394e59f76d1d62c634d37c5c19ac8603940872af48e8945