Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7f013d63707174…

MALICIOUS

PDF

90.4 KB Created: 2021-09-22 22:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cde74853511bd28324d3f1b22f6aaec6 SHA-1: 7d9b04efb24afea02d423eea6da2b564e15444b3 SHA-256: eb7f013d637071740a41fb572faf1fd20117511786357c059307d11abead4f79
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristic firings indicating it is a link farm designed to redirect users to external, potentially malicious, URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs, including algorithmically generated ones, points towards an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smidgel.ru/uplcv?utm_term=watch+zack+snyder+justice+league+online+free PDF link annotation
    • http://encino.ilovepokebar.com/uploads/files/63740132005.pdfIn PDF document text
    • http://asqcert.net/files/files/98893270970.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/20219191219369161.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/3569722315.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/butoxivatakatozemegikev.pdfIn PDF document text
    • http://idevoz.rs/files/rudugij.pdfIn PDF document text
    • https://protrialse.eu/files/files/93853870585.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/2244124832.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/levibaxekalijeriposod.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/mujozegujejikitusazefow.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/48419846706.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/80467348179.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/vitakido.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/xesidal.pdfIn PDF document text
    • http://tano-cable.com/d/files/misiridovujojekunin.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/oa426c5bm1rf7g9mulunm34707/47618071770.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/43276557597.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/detivalunafoloruz.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/19982901096.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/jolebexo.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/36e4c45616542d381fd3cad532f2f37b/legotuxa.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/fobixaga.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/87511138601.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://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_off0000f576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8D 11244 bytes
SHA-256: 37297bc5475bb05a081f7597fbfcdbb4202d9e915d1cf022eaaa4ac2b3f1578e
font_02_sfnt_off000127ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BA 19904 bytes
SHA-256: 67dbd4302c713a8b9afcc460d18bf0af02a112f69ad8effe742c8587ac003d4b