Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b3ff2fef52d004…

MALICIOUS

PDF

63.9 KB Created: 2020-12-17 08:45:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 1a34203210190d12eadaa6d993744d72 SHA-1: 96cca981e65ebdbf4489f33ce3859e8016ea8d61 SHA-256: 72b3ff2fef52d004403b44a413c3ac23e6c8fab6d78443b8e86f4b2aa35522d7
214 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO link farming to distribute malware. No scripts were extracted, but the embedded links are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://traffmen.ru/123?utm_term=gta+sa+cleo+mods In PDF document text
    • https://cdn-cms.f-static.net/uploads/4444371/normal_5fb76133542b5.pdfIn PDF document text
    • https://porijupipisezug.weebly.com/uploads/1/3/4/7/134718457/4aba89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479240/normal_5fc37cf1cb120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387716/normal_5f9b92cd48085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467298/normal_5fba18e5c44bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368736/normal_5f8ac47293f25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427093/normal_5fc2c186dab5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5f9ffb6a5ef99.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/98110499421.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/alien_shooter_td.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/bfme_2_rotwk_edain_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/honda_prelude_manual_transmission_oil.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/vinebusejadigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/801a13ce-367d-4344-93e3-e40e8364bf4f/meridifa.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_off0000b6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AF 5020 bytes
SHA-256: c11ad6fc103668a4acb718be9bda695d6e03fc11c2eecd5e03ed58b882cf0e58
font_01_sfnt_off0000c7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B3 12868 bytes
SHA-256: c6b06bd2bbce4971b0439f77cf39b78e5235609ebefcb4b66c729222773ac87d

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