Malicious PDF — malware analysis report

Static analysis result for SHA-256 080adf1795116396…

MALICIOUS

PDF

82.3 KB Created: 2021-03-28 04:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27394f8da0cec36de8aeb8da06960e36 SHA-1: 98cdc005758a2c0153464f8de97ced8ea7d1a92d SHA-256: 080adf1795116396f870501336f20ae0ed0d7cee7d1b79880e1dd9703dc5c3d7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are SEO-optimized and lead to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings. The primary malicious URL identified is 'https://xajibur.ru/wix?keyword=bridges+in+mathematics+grade+2+teacher+masters+answer+key', which is likely part of a phishing or scam campaign. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/wix?keyword=bridges+in+mathematics+grade+2+teacher+masters+answer+key
    • https://cdn.sqhk.co/feketukadoz/IhiOwhi/dpsdirect_portal_texas_gov.pdf
    • http://it50disconto.pro/34083930131ckfl.pdf
    • https://vobajorod.weebly.com/uploads/1/3/1/4/131438629/a14fe.pdf
    • http://micrometerdigital.xyz/jeppesen_private_pilot_faa_airman_knowledge_test_guidersgso.pdf
    • https://cdn.sqhk.co/zegareguw/agghjji/divax.pdf
    • https://zurukonovode.weebly.com/uploads/1/3/1/3/131379219/xowogezopiwenuxa.pdf
    • https://cdn.sqhk.co/fapolokid/UCjiphh/classical_fm_radio_stations_near_me.pdf
    • http://reactivaperu-2020.com/82091137550p0nyh.pdf
    • https://cdn.sqhk.co/vuveleni/ciiiaFR/xorikifedorikuwukitu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c8333ddf-55b6-4320-895b-9bdcbeb94328/89868509382.pdf
    • https://uploads.strikinglycdn.com/files/16a4c0f9-2c88-4d51-bf10-c6c4aab5edfb/collections_textbook_grade_10.pdf
    • https://uploads.strikinglycdn.com/files/92dc534f-aab0-473b-a8ee-389bddd9066d/sulirezuzuveguji.pdf
    • https://s3.amazonaws.com/zidenigad/67190080050.pdf
    • https://uploads.strikinglycdn.com/files/cd5464a8-fe3d-4b19-be86-18b9e3f8cf0c/75750541195.pdf
    • https://uploads.strikinglycdn.com/files/3afb099d-db48-4e18-b286-07cf0d2f3bf2/bevuburanerukafenur.pdf
    • https://s3.amazonaws.com/wenobagupexekap/41914410416.pdf
    • https://s3.amazonaws.com/zupenafud/d-link_dir-825_1_review.pdf
    • https://s3.amazonaws.com/pulavokaxe/sokosapalikosebovipize.pdf
    • https://s3.amazonaws.com/vufuzewasi/17692207970.pdf
    • https://uploads.strikinglycdn.com/files/c25cfcca-5b5c-45e3-b69a-14fc1e39b5ce/the_book_of_chuang_tzu_amazon.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001004b.bin
fc7e6ee376a31dba9d32fd7e97e186b49338069d21990586b8618d2740ea5e29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 5760 bytes
font_01_sfnt_off000113dc.bin
601ab58cf86daecd64f647e36ad98d8b061e1b1b009e2dc90a7939fe003b255f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113DC 11828 bytes

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