Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8cc11c799f9056…

MALICIOUS

PDF

77.6 KB Created: 2021-02-21 14:28:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 191ba56a2b57cf0c5e996e513bf9fa5c SHA-1: 86983fb9185c999c264aec7135aa7e6c4fef6e47 SHA-256: ed8cc11c799f9056833eb547b03f958e5296cdf57571c29d90398ae981cef2b7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model with high confidence. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malicious redirection attempt. The presence of external URIs and the link farm heuristic indicate the document's primary purpose is to direct users to potentially harmful external content.

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://leonvi.ru/123?utm_term=how+long+is+army+basic+training PDF link annotation
    • https://cdn.sqhk.co/wadusazilox/tYUhehc/text_art_copy_and_paste.pdfIn PDF document text
    • https://cdn.sqhk.co/mogowepuw/jiWjcjY/chikungunya_rash_vs_dengue_rash.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/qeicifg/46481656449.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/hwHiivL/zekejem.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/hjfp6rV/brain_games_full_episodes_national_geographic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485301/normal_5fd3a55b66cd4.pdfIn PDF document text
    • https://cdn.sqhk.co/virapazetif/hlWOiaf/big_sean_ft_migos_sacrifices_lyrics_az.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408990/normal_5fe5da264dc73.pdfIn PDF document text
    • https://cdn.sqhk.co/zevinikiwi/Kiieiix/34295859567.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/gS0zRic/spacex_crew_dragon_launch_date_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zazasos.rf.gd/davifetiripat.pdfIn PDF document text
    • http://magonusu.epizy.com/billardtisch_selber_bauen.pdfIn PDF document text
    • http://gefetela.epizy.com/sevirof.pdfIn PDF document text
    • http://mevezexagugon.rf.gd/cookie_editor_google_chrome.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/7796164513.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35A 5416 bytes
SHA-256: a75e50cfe640f4d05ebcbccd15da4dcc4fdef347a422f7ca36cf1a42b9a3fc45
font_01_sfnt_off000105ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CE 10460 bytes
SHA-256: 2449141d76209547fd9e4f2ff3d0741821c91773650d88d0f7e40693cdeb2142

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