Malicious PDF — malware analysis report

Static analysis result for SHA-256 541e20dedd7c0b11…

MALICIOUS

PDF

82.6 KB Created: 2021-03-08 06:49:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e3b3963990d5555dfa5220864f57f82c SHA-1: e5f4612a4f09a29606fcfbd1b21785019ff923c8 SHA-256: 541e20dedd7c0b1195d83664e0cb3b53243ca664c4e11007d108fc2550d26184
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary external URL points to a suspicious domain ('resalured.ru') and includes a keyword that suggests a deceptive lure. While no scripts were extracted, the structure and the presence of numerous links indicate an attempt to redirect users, potentially to malicious sites or for SEO manipulation. The ML classifier also strongly flagged this PDF as malicious.

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://resalured.ru/wix?keyword=milton+elementary+school+website PDF link annotation
    • http://wixiziz.iblogger.org/fall_foliage_report_blue_ridge_parkway_2018.pdfIn PDF document text
    • https://wagigezo.weebly.com/uploads/1/3/0/7/130775958/bagubomumi-tinubevipuk-xelijumagur-zatakoferososeb.pdfIn PDF document text
    • https://danikobunib.weebly.com/uploads/1/3/4/7/134755608/katiwizigode.pdfIn PDF document text
    • https://timokejega.weebly.com/uploads/1/3/4/4/134454798/1915981.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/gozilum/xadedinuk.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/sims_4_parenthood_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/scattergories_list_10_answers.pdfIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_978538858b3f433a9314eaf90925bd56.pdf?index=trueIn PDF document text
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_74f640578f6444a2b751366b3c895416.pdf?index=trueIn PDF document text
    • http://rakejobik.epizy.com/warbot._io_mod_apk_android_1.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/27383243447.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/83663438428.pdfIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_54b07a7f1eb6457991119ea78e83b85b.pdf?index=trueIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_3b0b298690b241aabcd8a5301799f687.pdf?index=trueIn PDF document text
    • http://wotolag.epizy.com/stuck_in_guided_access_iphone_11.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/45029486912.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/71970007553.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/nezupute.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_off000106b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B0 5380 bytes
SHA-256: 34e3497d6f9de3c6a25fc94666ccdd74e8e69511b2499a01d6f1b159ddfa6706
font_01_sfnt_off000118eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EB 10752 bytes
SHA-256: 4178b1e68b5fee8084eca489903e54f49b360ed58e347eb86d34cbdd7f4df375

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