Malicious PDF — malware analysis report

Static analysis result for SHA-256 1429bd0a61d7b8e0…

MALICIOUS

PDF

73.5 KB Created: 2021-01-15 13:37:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 528f3c725d1a9a80f0e36a827f0c14d7 SHA-1: 74015824d04e1f7bcc294e7cbeb58f508629affe SHA-256: 1429bd0a61d7b8e0b14047d6ba2bcb87fea5d53eda555e97d745477f8c43367f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate this is a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/aws?utm_term=aerith%2527+s+theme+piano+sheet+pdf
    • https://gebedevalofibut.weebly.com/uploads/1/3/4/3/134379687/1816127.pdf
    • https://site-1172238.mozfiles.com/files/1172238/tenebadabomexifusiw.pdf
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/dimunukowe.pdf
    • https://cdn.sqhk.co/nuzinipaz/1jbifYz/street_racing_3d_apk_android.pdf
    • https://site-1175728.mozfiles.com/files/1175728/33878238352.pdf
    • https://site-1171549.mozfiles.com/files/1171549/nike_outlet_website.pdf
    • https://site-1177580.mozfiles.com/files/1177580/o_que__movimento_uniformemente_retardado.pdf
    • https://site-1166068.mozfiles.com/files/1166068/yealink_t23g_manual_espaol.pdf
    • https://joxenawofin.weebly.com/uploads/1/3/4/3/134342561/6910908.pdf
    • https://cdn.sqhk.co/riragimi/jezXheK/jenugusejuxo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kitakilesa/auto_format_xml_in_notepad.pdf
    • https://s3.amazonaws.com/wipotegadodorek/57919115322.pdf
    • https://s3.amazonaws.com/duzexefemosaxe/dukudazovuzizoko.pdf
    • https://s3.amazonaws.com/wupixufekijax/rutot.pdf
    • https://s3.amazonaws.com/muvemasoxaji/begrijpend_lezen_groep_8_gratis.pdf
    • https://s3.amazonaws.com/nufidibodudulad/josupuj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc6d.bin
8e0216353342d73423cf3826be536dd1d7978a3c253f2f33741d48c31afea248
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6D 5272 bytes
font_01_sfnt_off0000ee35.bin
7aad36b2175ffc0bd6d303cb8e51279a1734fef09e15ba34a477f4bfb5bcdffb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE35 13848 bytes