Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e32a94e128050b…

MALICIOUS

PDF

80.4 KB Created: 2021-09-09 22:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 60c16f0cf278aafecc092713f6c17fe8 SHA-1: 7d4f8d929046a9b6b68e7d9e2e0443eca8dc3b8d SHA-256: b8e32a94e128050bd26e7ace4739e9a61dfd923034b0eff67671a0627e83263c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to potentially malicious domains, suggests a link farm designed to redirect users to harmful content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern, indicating a phishing or malware distribution attempt.

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 http://machinesupplier.cn/data/product/file/202196_211156_921.pdf In PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/99610365521.pdfIn PDF document text
    • http://vecsecity.info/editor_up/40582434238.pdfIn PDF document text
    • https://greengenome.in/admin/userfiles/file/seroge.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5d6b00d1---19811702833.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/86396427522.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/basilowefirofawe.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/memusojesonuzotulawi.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/68008539044.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/63160841307.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/kedilumevavi.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/pitoborebiwapekawo.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/6122458134.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/92436651985.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/20399747004.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/64822153739.pdfIn PDF document text
    • http://bjjiffy.com/upload/27791302569.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/lowozitumawitoxike.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/zelegi.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16134d73d36710---34067905769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=watch+step+brothers+free+onlinePDF 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_off0000d5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D1 17844 bytes
SHA-256: a2c420458324f46377f91c8731d6b725c4073f06c16e17bd23c09e0767d48645
font_01_sfnt_off000103f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C08 10708 bytes
SHA-256: a72fed76983415ebdfbeb87e23b7476dce7afc8e360e5dfeb6633a001adb483c

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