Malicious PDF — malware analysis report

Static analysis result for SHA-256 53bc9f3aae33db8b…

MALICIOUS

PDF

111.6 KB Created: 2021-03-18 06:20:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ccd1741321f97c9c32990e83497df98e SHA-1: 418961db7eddd9b61e0a38fc36e6633374025e9b SHA-256: 53bc9f3aae33db8b634d01eb76823f5bf36bf3148826eac79d9a5dea34fbe061
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 embedded URLs that redirect to suspicious domains, likely intended to host further malicious content or phishing pages. The document body, though heavily obfuscated, appears to be a lure related to academic text, aiming to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/award?keyword=barthes+theory+of+the+text+pdf PDF link annotation
    • https://cdn.sqhk.co/navimoxa/eiejeNf/33841047333.pdfIn PDF document text
    • https://cdn.sqhk.co/matajikiwov/igdgd4q/61129398612.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/gjioidW/lyrical_photo_status_app_which_country.pdfIn PDF document text
    • http://xegazinijitup.mywebcommunity.org/cfop_rubik_s_cube_method.pdfIn PDF document text
    • http://zutolewe.mywebcommunity.org/basic_automobile_engineering_book_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tarudifirew/7EUOohj/wishlist_apparel_reviews.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/67691675971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67f5ca53-c691-422e-9798-d1544376d13d/page_break_in_word_table.pdfIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_0b0d929b922d4ca589c485f606dac483.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nowokil/18804153112.pdfIn PDF document text
    • http://kofepiropi.onlinewebshop.net/58741223305.pdfIn PDF document text
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_b15e92c05ea541e3aee847f66f81c8fd.pdf?index=trueIn PDF document text
    • https://b1f0a730-f0e4-4bcf-918d-a915077b90d0.filesusr.com/ugd/a7c69d_8215a49211394d1facaf9dbf8d676a0d.pdf?index=trueIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_014ac85bd27c4677b156b1573dbc9fc5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/80952a6f-87d6-4730-b31e-5b769e5d16be/60561782235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5b7f309-1fe1-4de7-9798-8d3c5ff2233a/sony_str_1050.pdfIn PDF document text
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_33a188aedc23426fb520999928fb71b2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2438b8ad-d169-4c17-86b0-eabdb4e1f9e4/jovezusijasafiwoxugive.pdfIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_e77f717149ab4516b8b6cf3d5da0aedc.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_off000174b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174B2 5316 bytes
SHA-256: 439cf9682272ab241ee499f42a3a7ff09628d8a65166790ffba6db11912b3364
font_01_sfnt_off000186d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186D1 13484 bytes
SHA-256: b3bc4b132dd9cb17b85141a5f0639e0f2afee2b68cd7788a034fa44010bbb385

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