Malicious PDF — malware analysis report

Static analysis result for SHA-256 2358c72d001e2d1a…

MALICIOUS

PDF

191.9 KB Created: 2021-04-30 10:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 935c22ba5ca91a51e6fbe21dd003d5b3 SHA-1: c22c764a6997c4d3b36970a48a8c0d0e9a8fd154 SHA-256: 2358c72d001e2d1a5670831ac5765b77635cee8bccb37613fb0af628a9978efd
66 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm designed to redirect users to external URLs, with one such URL being identified as malicious. The ML classifier strongly flagged this PDF as malicious. Although no scripts were extracted, the presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 4

  • 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://seumenha.ru/strik?utm_term=2007+cobalt+maintenance+schedule PDF link annotation
    • https://zidimegaga.weebly.com/uploads/1/3/0/9/130969389/serezotad.pdfIn PDF document text
    • https://navanelesud.weebly.com/uploads/1/3/0/9/130969746/ruvetezu.pdfIn PDF document text
    • http://logunej.iblogger.org/borderline_personality_disorder_ebook.pdfIn PDF document text
    • https://derixajulinam.weebly.com/uploads/1/3/4/3/134356287/laxugodifid-jatoxojuvu.pdfIn PDF document text
    • https://zosufolukariv.weebly.com/uploads/1/3/4/7/134755865/bugijoli-fojitixabakuxam-titajilutaroge.pdfIn PDF document text
    • https://fumitalabojaluk.weebly.com/uploads/1/3/5/3/135399187/pajejebij_roponuwibiwuro.pdfIn PDF document text
    • https://vawevoza.weebly.com/uploads/1/3/1/4/131482963/1337544.pdfIn PDF document text
    • https://bugevokugado.weebly.com/uploads/1/3/4/8/134870551/fatadurok.pdfIn PDF document text
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/9305860.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457318/normal_5fc69e3909472.pdfIn PDF document text
    • https://juwufugoxeza.weebly.com/uploads/1/3/4/5/134528381/00eba0c1cc80.pdfIn PDF document text
    • https://tebifuwufarul.weebly.com/uploads/1/3/4/8/134886387/jebaxi-bakezorow-lijedu.pdfIn PDF document text
    • http://wuxijuvusif.22web.org/how_to_trade_in_stocks_jesse_livermore_epub.pdfIn PDF document text
    • https://zamidagotef.weebly.com/uploads/1/3/1/4/131453459/e756c0f.pdfIn PDF document text
    • https://bojetenabadi.weebly.com/uploads/1/3/5/3/135394614/e0bf018ac57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479932/normal_6064299f3d2cb.pdfIn PDF document text
    • https://wamazuwo.weebly.com/uploads/1/3/1/3/131380988/sonitugimukirinuzeru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nasakil.rf.gd/canales_de_comunicacion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6003fdab-a29c-4b51-8bc5-20830c9548cd/vijelotuvogulotodago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4174b6f4-086f-4d79-a3c0-af0c3491a3f9/666039794.pdfIn PDF document text
    • http://maretazijedoval.epizy.com/ncert_class_11_accountancy_part_1.pdfIn PDF document text
    • http://fanevisexika.epizy.com/vunasovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c075414-391a-448a-95be-909573a7dbc7/stihl_cordless_hedge_trimmer_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89c785a0-ff4f-4685-9fc0-35ff917edf0a/gunavigerexat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73998886-b8f7-4cee-bf37-89a934069742/sunizefilibogufegev.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002b315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B315 5484 bytes
SHA-256: 6c3678e25839ff638ab79adbdf1607e556c9c54c631d11a4f888c76c3c76cbe3
font_01_sfnt_off0002c590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C590 13104 bytes
SHA-256: 9133ea9ffb462f5e13bce0f56ba8264f76363c3012934327e4f7dfccdadcf6af