Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3e75ca47dae92a…

MALICIOUS

PDF

72.0 KB Created: 2021-02-12 12:45:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c398fe87c6b95883b905d1a848efe9c5 SHA-1: 217c9f6abf044b884947e298da836e4937e9a86b SHA-256: 4c3e75ca47dae92a3f37ffb4d49db5b884defe22e054acc71248639151c3b7d8
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirector infrastructure, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://crophysi.ru/123?utm_term=goto+java+equivalent In PDF document text
    • https://lizatupapej.weebly.com/uploads/1/3/4/4/134401074/voritekivoveka.pdfIn PDF document text
    • https://bonuwokepav.weebly.com/uploads/1/3/4/5/134592975/6850747.pdfIn PDF document text
    • https://jonexizuli.weebly.com/uploads/1/3/4/2/134235370/bokotavujevus_zosukonufimos.pdfIn PDF document text
    • http://segway-wheelchair.ru/86250963441t2rkh.pdfIn PDF document text
    • http://fasibada.22web.org/91604520852.pdfIn PDF document text
    • https://lavupujewefi.weebly.com/uploads/1/3/4/6/134631736/nigojeketopi_zesavabomi_fezoledobo.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/fekozip.pdfIn PDF document text
    • http://private-channel.site/chicken_little_storyhi8n1.pdfIn PDF document text
    • http://larts.digital/guess_the_movie_emoji_quiz_60qpaa9.pdfIn PDF document text
    • https://mitewowepo.weebly.com/uploads/1/3/0/8/130813710/f3afb7a31aa72c.pdfIn PDF document text
    • https://zaximasuxudaris.weebly.com/uploads/1/3/4/5/134590642/05ac22.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dinopug.epizy.com/sewigiponativaninenuz.pdfIn PDF document text
    • http://jojanotesejivi.epizy.com/bug_out_bag_packing_list.pdfIn PDF document text
    • http://boragilaz.rf.gd/92937532551.pdfIn PDF document text
    • http://tavokitewigi.rf.gd/html_template_for_email_online.pdfIn PDF document text
    • http://zagegorusur.rf.gd/best_online_games_no.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/tatad.pdfIn PDF document text
    • http://kedogevakubonog.epizy.com/42551849231.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_off0000db38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB38 4696 bytes
SHA-256: 072e1db6d9c4bb313c2e81d4132561184b030e57415a251fea6c57cc2ced4a3c
font_01_sfnt_off0000eb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5A 11684 bytes
SHA-256: 8debd11bc09de640c8be2eef2bbc145869b8909f6631e1240a328c3da15dcd9e

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