Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfd551718fb42cf…

MALICIOUS

PDF

70.6 KB Created: 2021-03-30 16:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 245ecb1ef454de1f80cc84e7ae108708 SHA-1: 2699b2414a34948f0018697e0bdc6dd3b8ab0959 SHA-256: 3cfd551718fb42cf31cb070b5cdbf333e14f9fe9b18e7996d89325aeac7efd8a
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://lozipotod.ru/strik?utm_term=is+high+blood+pressure+normal+during+pregnancy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485826/normal_60474e12f0778.pdfIn PDF document text
    • https://banijeweziwi.weebly.com/uploads/1/3/4/8/134873891/a27b8.pdfIn PDF document text
    • https://bexenexitefixu.weebly.com/uploads/1/3/4/7/134725849/a43ed245cb0eab.pdfIn PDF document text
    • https://rumevupalod.weebly.com/uploads/1/3/0/7/130739773/vagupotuduf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371010/normal_6052b1b5e5da7.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/rodiligarexo/34496714649.pdfIn PDF document text
    • https://79d8ee67-2172-45f8-9737-086b37aa5bdf.filesusr.com/ugd/2ab2ae_af2a0fbbd58b40b5af3a6b253849c1c5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21b5a8ae-30c5-459e-847c-306ce5de961e/sakarawobokebosatumikir.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/iphone_11_wallpaper_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/describe_a_tree_trunk.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/simple_interest_worksheet_shepherd_answers.pdfIn PDF document text
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_8b90eb73501d46dfb24b51aae13e5007.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/gojuwuloniwilijuniraxam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51b8fc18-302c-4c4f-9e43-84b8994803de/gozalavopadinigavasasipin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b13e597-ebe0-4d46-9a39-8eafda2f2f95/82380092460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e544f57-1bb2-4c50-aaf4-13a8fac6dab4/where_is_the_filter_on_my_electrolux_front_load_washer.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/list_of_sherlock_holmes_books_in_chronological_order.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/mitasegoxigozoburar.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/33082376568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20833525-d335-4da9-804c-18c47148c814/ford_mustang_gt_horsepower_2019.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_off0000d6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B5 5668 bytes
SHA-256: f1724b71d1ea70e24037ac8a1f0ee86422cf7048ab4b26356ffc19e7ebb07806
font_01_sfnt_off0000e9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CE 10292 bytes
SHA-256: 05e4ac9a4556ff692682eb6d10337c3385801e1cbffaa6aa59b10a6b7e060a36

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