Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e6eb2cf4690335…

MALICIOUS

PDF

82.9 KB Created: 2021-03-29 00:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: cafe8a0f21d32074df6e6b973e2cf126 SHA-1: 5a856a366276f91b92b4d607fd1586baac74966e SHA-256: 88e6eb2cf46903351d74299b0b7ac5187bb39dfa427e739b90fdef7eda8ab385
186 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that redirect to various external sites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to drive traffic to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://vilenefex.ru/wix?keyword=sword+art+online+2+episode+1+english+dub+youtube PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423133/normal_6029648c2a26f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478137/normal_5fe1c1dc74725.pdfIn PDF document text
    • https://belafawejogawol.weebly.com/uploads/1/3/4/5/134583754/8d0614fffefdc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461525/normal_6013069289ec8.pdfIn PDF document text
    • http://ecoterritory.store/povipokatuzafamipibx6w7.pdfIn PDF document text
    • http://nikaold.site/freedom_tower_elevator_hackwg8kj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409811/normal_605793e4c9d36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530846/normal_5fdb73c1ef31b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379377/normal_605cab951d23f.pdfIn PDF document text
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/pekevoje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416661/normal_602d25dd47fbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374838/normal_60144e9e2d722.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/vewefovimemqhot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379964/normal_601aa91249d02.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_31e4d1fca7144600a54aa06d214a685f.pdf?index=trueIn PDF document text
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_50461b7dbc6c4b8b9d163194d972dee3.pdf?index=trueIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_75795f176b37447184c930b54d38b1bc.pdf?index=trueIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_99dc41668b174d6a9bfd8f0ab0c18886.pdf?index=trueIn PDF document text
    • http://moxutomib.rf.gd/wosawuxawowufuk.pdfIn PDF document text
    • http://kuxasetep.epizy.com/zedepadodun.pdfIn PDF document text
    • https://655b5f2c-2f45-4411-b579-7e5bd587bf3d.filesusr.com/ugd/2a272b_cf87e3cca457470c81a875a40351165c.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 4212 bytes
SHA-256: 3098b23edbc17519a5a20598d6dcb0baac08fb217d90d1510c0cc128712259a5
font_01_sfnt_off000103ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AB 5840 bytes
SHA-256: 5c092c7087ac739c27e2f990a189ebfd80f92eb811edbea1bdbf2917cd474067
font_02_sfnt_off00011793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11793 10724 bytes
SHA-256: 65df5648a3fdc75716608ae90cc29a2fff0e76e88db4cdb67fa38b8f89c1fd57