Malicious PDF — malware analysis report

Static analysis result for SHA-256 1282cfa186a08651…

MALICIOUS

PDF

78.5 KB Created: 2021-03-16 23:50:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: fd2de6517e55c3fd3c7bf65a458b10e9 SHA-1: 2386caa0410e954236d047adb60b9b18c3847c86 SHA-256: 1282cfa186a086515e1912396fb0027a2d418cccc8766b64e4f110b9e6a7926f
186 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 domains, suggesting a link farm or SEO spam operation. The primary URL, "https://soxebez.ru/123?utm_term=quadratic+equations+kuta+software+answers", is presented as a lure for information on quadratic equations, but is likely a redirect to malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/123?utm_term=quadratic+equations+kuta+software+answers PDF link annotation
    • https://cdn.sqhk.co/wujodazera/ogTgdgg/iphone_ringtone_naa_songs_free_download.pdfIn PDF document text
    • http://mavogevuz.getenjoyment.net/putagizoser.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/9xchjK9/best_launcher_for_android_2020_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/0jidhbL/sniper_3d_porter_heights_mission_14.pdfIn PDF document text
    • https://titanukudolilip.weebly.com/uploads/1/3/6/0/136082060/getodat.pdfIn PDF document text
    • http://rufawefojag.sportsontheweb.net/angle_of_elevation_and_depression_worksheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/POjnsgh/halloween_costumes_ideas_2020_men.pdfIn PDF document text
    • https://vifomamup.weebly.com/uploads/1/3/1/1/131163898/07ae9984e9e.pdfIn PDF document text
    • https://sulasaboxa.weebly.com/uploads/1/3/4/7/134767053/3b1c86e2262f903.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/vonutavekip/kefigugafevurun.pdfIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_76272bcac37042adaaeacf64338e9a06.pdf?index=trueIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/william_shakespeare_the_taming_of_the_shrew.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/free_prezi_templates_for_students.pdfIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_d6ded9db1e224287b39a278279677917.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/erasmus_programme_guide_2019.pdfIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_c1acbf0b9a854b228f5cd46f6d0af67f.pdf?index=trueIn PDF document text
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_5f87b93c405a45e3894054b945a244ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/21347700006.pdfIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_02bdfb0f27c54eb8ac93f67a74121e87.pdf?index=trueIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_815a06af493c4726882aa46b9eb8218a.pdf?index=trueIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_d9a258488c7c4664a92a0ac1692859c2.pdf?index=trueIn PDF document text
    • http://famekuputoda.myartsonline.com/fundamental_bacterial_genetics.pdfIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_0b715f848a15491fb4962dac52c43355.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF593 5324 bytes
SHA-256: 75aa0e4346cb434637dac221f71fdf59749e3414a629a83cb9a1ed774d494303
font_01_sfnt_off000107d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 10724 bytes
SHA-256: 6c2bc43842ed87e7d120fdb19f3bfd030d5c57908d8fe1f3f08495d6da52788d

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