Malicious PDF — malware analysis report

Static analysis result for SHA-256 098a763a76269f50…

MALICIOUS

PDF

70.9 KB Created: 2021-09-10 23:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a1581f1b1bf3835c5828b0a406dca67 SHA-1: fe1194e5ee81d7965157e51117c5da2cc4f1ddaf SHA-256: 098a763a76269f505c1f14323557413885b7848189796dc27103064df0a8b990
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm or phishing infrastructure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a non-clustered link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://allytemp.ru/uplcv?utm_term=voices+of+freedom+eric+foner+pdf PDF link annotation
    • https://paklya.su/design/img/upload/file/86248513233.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/zuzex.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/743381962.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/didosimizarenifofiniwo.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/bc50771868a8dabef5994f37577dbb3f/maratetilejesuvep.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/lapoxipesetugugopenob.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/13228167518.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/1482687623.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/rakobudetaxolekukusagof.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/lirujirerusuvifaje.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/49201491750.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/gajufemat.pdfIn PDF document text
    • https://eniedu.com/data/file/20210905195145.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/lezasiref.pdfIn PDF document text
    • http://01host.ru/userfiles/files/buluduvolesobosutavijus.pdfIn PDF document text
    • http://puisan.ru/uploads/file/busafubaworokolisapaf.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/87872664149.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/66708176923.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b4f7d769---leziporanobiforawufufip.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/gedafiziwubok.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_off0000b336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB336 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB48 16928 bytes
SHA-256: ba991b123bcc2eddd7295a7a63423ad5b19248cf2926dd29ea55cd3dafbc957c
font_02_sfnt_off0000f6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 10444 bytes
SHA-256: d44aca4dbb589dba70c8b69e5568647c5586972c6a851be32b7b0d9e3ffd91d1

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