Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5dc8765e6e25ec…

MALICIOUS

PDF

75.0 KB Created: 2021-10-06 11:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 07723f2e4eb2fa633b975dfe325953f2 SHA-1: c9fcae8652e75023a488510c636c878d57508f11 SHA-256: ea5dc8765e6e25ecc703028206e23902c3dc595931fe17c7159d19c373df1dca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, indicating it functions as a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts suggest a malicious intent, likely to distribute phishing content or malware. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. No scripts were extracted, but the structure and heuristics point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nomylo.ru/uplcv?utm_term=the+pell+grant PDF link annotation
    • https://soudureornementalelauziere.com/upload/editor/file/mojozopibevaxubakikij.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/loxitoxufasepini.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/pusafogupel.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/90435804154.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/15270026130.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/25642308492.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/kulawuvizajajanuwige.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1c5dd4cf401eead3ff385a6fee45e674/99896947141.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/tamiso.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/zinix.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/u8pk8ln4c0sitc2at1vjmp5i8m/21209689736.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/kinax.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/4348560557.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/nomupodikuxukusegada.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/70994399687.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/88873455364.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/56129673205.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/tadeforaf.pdfIn PDF document text
    • https://csn-alliance.com/data/files/38692876137.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/fotakexakarefibit.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_off0000c357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6E 10116 bytes
SHA-256: ef8f378b8f8c7cbff67748e281b1d0457e4ea2c7e8bfff7e29ea013adfa72a1d
font_02_sfnt_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 17712 bytes
SHA-256: 8ef7a4fc116a5ea1e84ec96645060cf648f4b9467a6a69130be2c66399d954c3

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