Malicious PDF — malware analysis report

Static analysis result for SHA-256 25126cd4123635e4…

MALICIOUS

PDF

98.3 KB Created: 2021-03-29 19:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d1f41359d31e040208f692efc5928043 SHA-1: cb5f80a295bee7b37d87b58c3e9ca1ef1b2d7a14 SHA-256: 25126cd4123635e4d5498d9e7390801f020a73a4d8851928e73898e8a1460293
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute potentially malicious files. The ClamAV detection and ML classifier strongly indicate malicious content, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/award?keyword=ibps+clerk+books+free+download+pdf+2020 PDF link annotation
    • http://motubudasuvapan.medianewsonline.com/99791785984.pdfIn PDF document text
    • https://cdn.sqhk.co/dawadetugas/hg4icf3/71102156248.pdfIn PDF document text
    • http://gratoramaa.website/razex3ebes.pdfIn PDF document text
    • https://cdn.sqhk.co/sixerusesebu/qbggDgd/wijaboluwugotefimivif.pdfIn PDF document text
    • https://cdn.sqhk.co/gewanunu/f2vicEo/57986662820.pdfIn PDF document text
    • https://cdn.sqhk.co/pozusawaja/jiCwge3/fediduwetuvutizowugur.pdfIn PDF document text
    • http://winoraama.space/kalukodopadejofanufatu3tsmp.pdfIn PDF document text
    • http://folugomobok.getenjoyment.net/perrines_literature_book_12th_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/xizefonuma/g5N326T/livokurefijegofavam.pdfIn PDF document text
    • http://wojurimaxab.mywebcommunity.org/career_paths_cooking_download.pdfIn PDF document text
    • http://bioforcecolumbia.site/radilifonitufonogge7fn.pdfIn PDF document text
    • http://jebifawulu.mywebcommunity.org/bevijedali.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_54998fd632814d0e87f89a1df41dba22.pdf?index=trueIn PDF document text
    • http://nufewusuk.rf.gd/banish_sentence_formation.pdfIn PDF document text
    • http://zabesawafusoxa.rf.gd/top_answers_for_interview_questions.pdfIn PDF document text
    • https://107a3552-ed21-4f5d-95e3-510b6eae4444.filesusr.com/ugd/21bbef_75207f261c9e4666b89952d9b5ce824b.pdf?index=trueIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_6d11693521c74588890d0a65d17b88af.pdf?index=trueIn PDF document text
    • http://tudaxagobex.rf.gd/10775298575.pdfIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_966e989fd89c4f0aa6424203c54eab8a.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10600 5656 bytes
SHA-256: c0f04b42e463aefd643e075fac3db186f81767efbecf9e72c9909a91c488a234
font_01_sfnt_off00011955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11955 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off000124b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B0 2092 bytes
SHA-256: 6e5de5c6bcb7fdd8c5ca0d25823a8f80e6c764803c1b732dbc9c425a5c0f8ea5
font_03_sfnt_off00012e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E56 11124 bytes
SHA-256: 32a924d346b80d7e5f04aa2659250073ffd1e1340e30bd529416e7f59d48989a
font_04_sfnt_off00015493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15493 11504 bytes
SHA-256: a87b0c608a1cf5d767a25db3150e46a213ba857f68ef12d697f59be775ba6bae

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