Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf18c33718be7e1d…

MALICIOUS

PDF

79.9 KB Created: 2021-03-31 10:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7f1576de2a9f6b75daa4b4d33549ea66 SHA-1: 7fac51ff8595ca9de296cf4f0ee86cf16797e01e SHA-256: cf18c33718be7e1d8656d643b3dc3dfc06d189ee70a3e1121059e6e3af3d10dc
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to host further malicious content. The document body, though heavily obfuscated, suggests a lure related to sheet music, which is a common tactic for disguising malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://fokemale.ru/123?utm_term=a+thousand+years+piano+accompaniment+sheet+music PDF link annotation
    • http://pakekoramiduwin.getenjoyment.net/sinekebuxej.pdfIn PDF document text
    • http://bigtittybella.com/zoforusibarodazedojibatonb4c.pdfIn PDF document text
    • http://pay-order.info/stihl_ts400_service_manualsequh.pdfIn PDF document text
    • http://gufutaca5.xyz/cdf_vs_weibullgqfmp.pdfIn PDF document text
    • http://bebalezuve.medianewsonline.com/nonetazugasoje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_605eee14a5e1c.pdfIn PDF document text
    • http://zajiledafalam.getenjoyment.net/vavewajutizukaz.pdfIn PDF document text
    • https://xomowozijirogap.weebly.com/uploads/1/3/4/6/134667332/tuguxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465557/normal_5fdb80cb77ce8.pdfIn PDF document text
    • http://milanbeachs.space/vabamisumeputagulibi31izk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447877/normal_602d54e6bc3b2.pdfIn PDF document text
    • https://jowatoziji.weebly.com/uploads/1/3/4/8/134893097/82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417327/normal_5ff7d2bedea9e.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/b742e7d5-edff-45a8-a9c0-061b65bfa0c0/old_troy_bilt_tiller_attachments.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/vsco_for_android.pdfIn PDF document text
    • http://tagijonegularol.myartsonline.com/nurizut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b945fce-55a3-4dcc-93a2-579a452a0b12/ti_84_plus_ce_calculator_not_charging.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c184b21-d606-4e5f-ad4c-429168be0dd9/www_kellysolutions_com_renewals.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/popubib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3003c6b2-c5b9-4526-bb2b-96580fb5819f/john_deere_lawn_mower_repair_manual.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_off0000f923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF923 5372 bytes
SHA-256: a94d1669f18d6079ffe006881948f2a16d287de287f736503048c8463eb249c9
font_01_sfnt_off00010b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B45 11256 bytes
SHA-256: 2b5a8338d6b08af238135cddbef76668dcf5a3c74c7c51515931be756d44789a

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