Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e653efdee0ad1e…

MALICIOUS

PDF

85.4 KB Created: 2021-09-10 02:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dac6e366808803d2ed6a0a83bfc0fc56 SHA-1: 056c2dc89f83b2377c34759479c7e9abb4a850cc SHA-256: 28e653efdee0ad1e6b848258635426371054c7ca39882e9131b71d48fd1c05b5
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. The PDF contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The presence of external URIs and the overall structure point towards an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://ijfbn.com/editor_up/bufaridatavifivik.pdf In PDF document text
    • http://bedrucken24.de/userfiles/file/77492300469.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/tupogojedesowujuwozam.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/jowasetemekozefuwuganavov.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/kadisolamelunoguwa.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613a10cdb2b05---96308330839.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/59369876114.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/gatepim.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/titosedeve.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/29622236260.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/12147096069.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/33929699808.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/63519915438.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/66112178080.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/62960158773.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/xozogemefilifobi.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/saziwisejavixudifujok.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/fumijamojeka.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/8653860897.pdfIn PDF document text
    • http://etre-belle.su/images/file/peguxes.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/baxetiwikoxupofizijunixu.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/rowewolabakidupujakaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sonetel+android+appPDF link annotation
    • 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_off0000ec70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 10292 bytes
SHA-256: 46a997d6102fc2f98ac85cb86a66c7079129b808e57b80027c33975a3adbb6a5
font_02_sfnt_off00011bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC6 17180 bytes
SHA-256: bda1be34d9e0e1dd63cf3cefc793f6cf5b46916f7e556d38049b690067ee33bf

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