Malicious PDF — malware analysis report

Static analysis result for SHA-256 d478150803f5335d…

MALICIOUS

PDF

80.1 KB Created: 2021-02-28 04:05:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 878b996ed6a788a5e3eea5a97c6e1fe8 SHA-1: 9c2f8fb738fbbabd11c91ef4c528ecf05dd5e66b SHA-256: d478150803f5335d6c56fe2dbab2c7ad446a598d74d73596d9aec15db60a873a
66 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious with high confidence. It contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classification strongly suggest the document is designed to redirect users to potentially harmful sites.

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://jacksth.ru/aws?utm_term=1997+mercury+150+efi+fuel+pump PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4466154/normal_5fe17bd2ca754.pdfIn PDF document text
    • http://wordsidepost.top/31810785502tqhqc.pdfIn PDF document text
    • http://finonit.mypressonline.com/how_much_do_interior_designer_make_a_year.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367947/normal_5ffade559f0aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471275/normal_603ac197d9f27.pdfIn PDF document text
    • https://pimazapodozem.weebly.com/uploads/1/3/2/8/132814260/tuxuxun.pdfIn PDF document text
    • https://tapukupe.weebly.com/uploads/1/3/4/7/134717462/8082150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367927/normal_602e2c8dbab24.pdfIn PDF document text
    • https://kebusivurokolu.weebly.com/uploads/1/3/5/3/135317059/b0f7279b52.pdfIn PDF document text
    • https://gokixojegesefa.weebly.com/uploads/1/3/4/8/134864476/5956748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413842/normal_5fdc3dc4ee6f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://keberefan.rf.gd/69058637883.pdfIn PDF document text
    • http://mukajuzata.rf.gd/78594456304.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/69707587725.pdfIn PDF document text
    • http://piwakitidi.onlinewebshop.net/700402706.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/legend_of_zelda_walkthrough_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/drop_test_report_format.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_off0000fd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 5332 bytes
SHA-256: d83b15823ff52c3b35604d7a718603273ae04f36eca43d9d7eb7c6e3cd7ff8ce
font_01_sfnt_off00010f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F33 10752 bytes
SHA-256: 0e6bca118727a19e9f88650fbba021f59998d27100525a9df0ce373090445fb5

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