Malicious PDF — malware analysis report

Static analysis result for SHA-256 100813e54d28abc3…

MALICIOUS

PDF

40.1 KB Created: 2020-10-03 22:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cf951b2436ae7274b0d491a6a876b050 SHA-1: 10bc88903c7197ea20b535ec526905030b06b21f SHA-256: 100813e54d28abc3832340556f0a4fc477437a30c94be62d242cfa9bdea6eb8c
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, appears to contain URLs that are part of a link farm hosted on disposable domains. This suggests the primary purpose is to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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://cctraff.ru/strik?keyword=binary+multiplication+examples+pdf In PDF document text
    • http://files.dahliaacresfarms.com/uploads/1/3/1/0/131069781/zewaxajodozubuw-webabilo-vonexudurogogow.pdfIn PDF document text
    • http://files.happybabylaser.com/uploads/1/3/0/7/130740049/magijam-palidafazise-kosijebijuku.pdfIn PDF document text
    • http://jibifato.susanweisz.com/uploads/1/3/0/9/130969937/zowiribajujiwajizi.pdfIn PDF document text
    • http://files.carobinstitute.com/uploads/1/3/2/7/132710592/2665326.pdfIn PDF document text
    • https://site-1036702.mozfiles.com/files/1036702/85505281813.pdfIn PDF document text
    • https://site-1036803.mozfiles.com/files/1036803/letedibexesonururaropal.pdfIn PDF document text
    • https://site-1039492.mozfiles.com/files/1039492/kogefiwetexezebuwam.pdfIn PDF document text
    • http://xizami.hula805.com/uploads/1/3/1/3/131380594/40a360f1136e8.pdfIn PDF document text
    • http://mexexuf.nev-r-enufsportfishing.com/uploads/1/3/1/6/131606620/957ae6aa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9aa37b6-037c-403b-bfb3-f6755d65b58d/ponibazaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b680c8c3-0a4e-4a92-8cb8-f28ccde2f326/16166859440.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_off00005e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5A 5520 bytes
SHA-256: facbd7f75007717425d158673276c6c9c143de12bec0f59547dd62ee65254c58
font_01_sfnt_off00007114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7114 10216 bytes
SHA-256: 36ebada954b33213b1944e18dda19052a8ddfcaa371d2db9c1e96a228d20b42d

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