Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00a8c3dfad2f4b5…

MALICIOUS

PDF

82.6 KB Created: 2021-03-18 10:58:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 97abf4da71490cf519cd6369d33acdff SHA-1: 73fefd2e2f1a5ce51827dfd1e3e33def2a782276 SHA-256: c00a8c3dfad2f4b54029c1404cf63d3ad6955c25a17c91c3f19b4040966cd014
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 embedded URLs, with one prominent URL pointing to a domain known for hosting malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host many links, likely to deceive users into clicking on malicious destinations. No scripts were extracted, but the overall structure and URL findings suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/123?utm_term=nomao+camera+apk++aptoide PDF link annotation
    • https://cdn.sqhk.co/lokiwejawe/Fjbhhko/19128741174.pdfIn PDF document text
    • http://devgame.design/vuvuviragapumaxunarin6nf1.pdfIn PDF document text
    • http://betizekaxu.getenjoyment.net/ruger_lcp_crimson_trace_pocket_holster.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366321/normal_5ffdaac23bd5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402252/normal_5fdf011d35c6e.pdfIn PDF document text
    • http://interbank.link/zofisawitobomotijafisflom0.pdfIn PDF document text
    • http://honbiz.pro/house_of_night_tv_series_2020_release_daten7apy.pdfIn PDF document text
    • http://rijunoje.mygamesonline.org/45084950135.pdfIn PDF document text
    • http://winoraama.website/suddenly_became_a_princess_one_day_novelm89wy.pdfIn PDF document text
    • http://lirebuwoke.mygamesonline.org/20309820089.pdfIn PDF document text
    • https://cdn.sqhk.co/temegolu/SYib7jc/19361151738.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/Ugg4hbo/fuzifatobafifibexaro.pdfIn PDF document text
    • https://cdn.sqhk.co/gosukutusu/wQDoghF/raid_heroes_total_war_hacked_apk.pdfIn PDF document text
    • http://nunovoxiwanafuz.getenjoyment.net/background_color_jspdf.pdfIn PDF document text
    • http://www.opentle.orgIn 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/e4f1feb8-53b0-4f75-8116-b94be77f6b6e/xusozojulago.pdfIn PDF document text
    • http://xabudavadeguvo.myartsonline.com/51822113437.pdfIn PDF document text
    • http://masemipeba.myartsonline.com/murujokobetobimufejel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abf0cacc-d0cc-49bf-bd75-745b773a8ff3/64240805730.pdfIn PDF document text
    • http://moxadokikubod.onlinewebshop.net/71533234442.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000fe08.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFE08 9004 bytes
SHA-256: a30676b4d5a6969c6d4e59ce3263f8cb91db1acb7731b536216b6546f49802a6
font_00_sfnt_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 5040 bytes
SHA-256: c9a53756e3b7aa1540db3747c35881343ba2f1cc271f0d8b1ec85e460ef1d781
font_02_sfnt_off000116d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D5 10756 bytes
SHA-256: 9703c690870b6ef4cabbf7b6d32e77cfe98e62970128a0d674d59f1a21a5ee36

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