Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28be5abe54911d5…

MALICIOUS

PDF

78.2 KB Created: 2021-05-20 01:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: dfb953365ef9ba9a36d0bcd3eda6e7b3 SHA-1: 5b25d69f760e13fc4ed465379541fd427440a6ae SHA-256: a28be5abe54911d5d19396e73f8c4edf1c225fae8c498ffdadf953b65eff090e
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://soxebez.ru/strik?utm_term=aws-certified-solutions-architect-professional+dumps+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454995/normal_6058dfe25b762.pdfIn PDF document text
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/e38c8.pdfIn PDF document text
    • https://biroputasore.weebly.com/uploads/1/3/4/7/134747039/xurij.pdfIn PDF document text
    • https://kivalake.weebly.com/uploads/1/3/4/8/134885121/582fe5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466675/normal_601602fbda309.pdfIn PDF document text
    • https://zopizegojuv.weebly.com/uploads/1/3/1/3/131380511/kizipasesijupof-nomawedegomib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391915/normal_60407fe8a8f85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489717/normal_605f39fc76942.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f99ebee1-f971-4a00-9d79-5da381bef876/jopilixatamewufivexipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d292af3e-d7e0-4e6e-8066-e2536b650089/robonawagoximaleve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85bc5c36-8df3-4060-86b1-a5156654d9e5/87473465449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc928e5c-9276-405b-b281-4d599ddbc3da/89437796870.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bc69149-37bd-4bfc-9c39-709ee7d639da/subway_menu_prices_canada_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/electricity_worksheet_grade_4.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/tivikorasutiru.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/kinesio_taping_for_tennis_elbow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28c2304b-f508-4bb9-b954-3006251cf8b1/what_is_the_coldest_habitable_place_on_earth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e62e61e6-2729-4c87-a65f-5cc53170e4bc/muniwowimoxeperon.pdfIn 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_off0000f20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20B 5508 bytes
SHA-256: 0f8dec12dc2174c77c1abbb73ff4213329843f44109d97a39bb1127bf9afd388
font_01_sfnt_off000104bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 11464 bytes
SHA-256: 9394efc805a542972ba70d950ea6a8db5b7ae49bc0ed41bb9e1a5824513a2818

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