Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed04132602574265…

MALICIOUS

PDF

80.3 KB Created: 2021-09-22 15:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: aa036dccd0d9513b4f974df1bf4f07d2 SHA-1: ed2109fb15259e9c257aa074bbc27ac5a4288224 SHA-256: ed0413260257426540a334bdb321ca4280b8ad46fa6383ac2a7693d30e426c6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates the document's purpose is to host a large number of links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://archism.ru/uplcv?utm_term=logo+maker+android PDF link annotation
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f29e94bb04---92409287453.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/59643683596.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/suvupemebifipik.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/79467958802.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/55483372329.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/rexapasetuwadalasufemur.pdfIn PDF document text
    • http://chromavials.com/d/files/joguzogasakofedotimaxoloz.pdfIn PDF document text
    • http://vinmexindia.com/uploads/27165078461.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210922175150.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/fedagozav.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/bupijuvatisi.pdfIn PDF document text
    • https://ntc-container.com/upload/files/69328874900.pdfIn PDF document text
    • http://zeci.nl/im/image/selewolotesemavalelisoma.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/33451890412.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/51742606318.pdfIn PDF document text
    • http://lex.tj/img/file/jixofobenofojazobe.pdfIn PDF document text
    • https://actor-conseil.com/files/file/xuweguwaz.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/88799198528.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/pusokuwikeleripo.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/47997023859.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/85664324945.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/93072601769.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_off0000d585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 18160 bytes
SHA-256: 6cdede27d69258ef2e920d7d135d2e61898536a15e14e0094ec881d577a75fc0
font_02_sfnt_off00011d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0B 10328 bytes
SHA-256: fee7a18f9b690dbaf08fd654f6c79f46f795dbd2b98587865b895f62ad501426

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