Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6e34aeb6bedd8a…

MALICIOUS

PDF

82.8 KB Created: 2021-09-09 12:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e945f9775fb32ea0547feec458ef4a79 SHA-1: b7903765dfd20875845bf2b08268ed0d1ea3af11 SHA-256: bd6e34aeb6bedd8a964a4531f6a8a5ca36d5167850f2bc1a765270ac0a0e9635
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and link farm heuristics, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs further supports the attack pattern of luring users to click on links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=ios+and+android+app+developer+job+description PDF link annotation
    • http://roycraft.ca/userfiles/file/totekodesutekokefetavu.pdfIn PDF document text
    • https://aaaxxion.info/images/file/58506172483.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/46702717962.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/kuguzuxuxepalurevijoga.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/93117793262.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/25626378389.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/45387078275.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/88407145377.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/47885799131.pdfIn PDF document text
    • http://seamacros.com/upload/file/33773236199.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136efc284288---98873163715.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210907_091625.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/katadosuwuwuwujexipalu.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/vexajoguzisili.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219580207638.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/40839549098.pdfIn PDF document text
    • https://fond.ru/userfiles/file/96356767531.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c99b9642e---14755746684.pdfIn PDF document text
    • https://fototipia.hu/files/files/rebagubod.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/nogilujuramidozudalutit.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/6235887451.pdfIn PDF document text
    • http://rilta.net/userfiles/files/digaw.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631153671.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/71286833079.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_off0000ddf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF6 10796 bytes
SHA-256: 7577e5561477c38a303f3eda5dee17b54ba42240fb06296105b865bcfe480a4a
font_01_sfnt_off0000f6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A4 17672 bytes
SHA-256: 54d5f66cf2694f6ed4c8c32e79405df2969d12b9bab76c42241584880b0779e6
font_02_sfnt_off000124fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1