Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ef77150ae906d4…

MALICIOUS

PDF

85.2 KB Created: 2021-09-09 13:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 112e9e9450b58ac572c8feaf46e1f065 SHA-1: 597680b8057336d61b42f5e2968b3203ea3fd8b0 SHA-256: 15ef77150ae906d4bd8c0c8cfd09403e7c5f2bcd4ac88e64eae1f493f15cad0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm designed to redirect users. The presence of external URIs and the link farm heuristic suggest the PDF's primary purpose is to redirect users to potentially malicious websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=vsco+all+filters+ios PDF link annotation
    • https://masihpt2.com/contents/files/semumigotipitazaz.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/13701629722.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/jopukiriramodorubi.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130677380991---nileduzozusepupedunon.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/nowatepiwofavijiwewemab.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/31057401118.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/63591127378.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/31428660499.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/35339732822.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/77526891010.pdfIn PDF document text
    • http://accronline.com/userfiles/file/bavigalugotedonujusulub.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210907060636.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/jaxoku.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135313672011---wanatovibako.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/47153339122.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/73872698673.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/pivasaraweduxafojonax.pdfIn PDF document text
    • https://msiutilities.net/documents/remalamonise.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/natod.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/50375712101.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/44209167397.pdfIn PDF document text
    • https://siroyensao.com/upload/files/15347459959.pdfIn PDF document text
    • http://emeat.ru/var/files/xokumo.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_off0000df41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF41 10192 bytes
SHA-256: 0be6f67634a9ea0db50bb428ac0c2fd4d79bdc6928c247ed2c08e32ebafc2beb
font_01_sfnt_off0000f644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E56 21748 bytes
SHA-256: 74c0d4077cfabf37be8247a10d0d6ab9c8941b713519a5f1af212cdc16d48e5f