Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a442de2bfaf0c70…

MALICIOUS

PDF

75.4 KB Created: 2021-04-04 06:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b792ffc5b8d2f070cc99952c16ca74a6 SHA-1: 57816710c620ba2784755e7eb31ac8c9db7a1119 SHA-256: 1a442de2bfaf0c70512acea71d6fbf2bc76a4bccc7f3cfce7c104464185fa8b3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many of which are SEO-optimized to appear as legitimate search results for books, but lead to other PDFs. One of the primary external links points to a URL that appears to be part of a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://nipisod.ru/award?keyword=arduino+programming+in+24+hours+sams+teach+yourself+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460954/normal_5ff451449a785.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/american_college_of_gastroenterology_guidelines.pdfIn PDF document text
    • http://waliduv.mypressonline.com/what_is_the_energy_associated_with_the_motion_of_particles_in_a_substance.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427097/normal_5fd9112325dc2.pdfIn PDF document text
    • http://wotedogupowu.sportsontheweb.net/goseluxolowe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501991/normal_60369eb677c0b.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/filidabut/countif_date_range_google_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/masabakale.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/3929509995.pdfIn PDF document text
    • https://f8b57e9d-e272-4783-b6f5-6420e6b93425.filesusr.com/ugd/886b73_2ba7fa040c77447187b4bf1ec0c49ae8.pdf?index=trueIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_aa7d78c083ad417d945c084bfda1d9c6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/employee_name_tags_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9f45dc9-1962-4505-bd9e-71354390ed56/73811741602.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/58277149038.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/bts_love_yourself_answer_album_full.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/editable_certificate_template_design.pdfIn PDF document text
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_fb554a9372b8412ca832726e4e3f312c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/00669aa7-ead5-4cc9-8d53-49fee4d3a708/australian_construction_cost_guide.pdfIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_9918ee01f04b4d3ba1c8baf4dfac61d1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/ganapathi_sahasranamavali_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/kenavebur.pdfIn PDF document text
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_ca574e7289234beeac1ace0797807b59.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_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 5880 bytes
SHA-256: 8c578dec6dbe393acc160f4aca364bede1d1f5880da7cb51555933d78b690b56
font_01_sfnt_off0000fba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA5 10700 bytes
SHA-256: fe96ecab02bb64d6bfc7e14c56f9742c8a10554deb80059f802be2fdb184d4ff

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