Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9450ccbd6868fe1…

MALICIOUS

PDF

72.7 KB Created: 2021-02-08 23:56:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 77975fc303eddd0a03cffd4e7d7dfcd5 SHA-1: e38c01164c9cd7bf5b483e432302e0dba0e84333 SHA-256: c9450ccbd6868fe1c7614bc6649baa534e0739d29d6ccbd53070eeb93d24f562
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains multiple embedded URLs, with one specifically appearing as a search result for 'guided reading group activities year 4'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF is part of a link farm hosted on disposable domains, suggesting a malicious intent to redirect users. The ML classifier also strongly flagged this PDF as malicious.

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://baarspo.ru/aws?utm_term=guided+reading+group+activities+year+4 PDF link annotation
    • http://afracheat5.xyz/dub_music_player_pro_apk_crackedtjtsh.pdfIn PDF document text
    • https://cdn.sqhk.co/dexizajifu/jhIuLgd/ikea_used_furniture_buyback.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487902/normal_5fd651327486f.pdfIn PDF document text
    • http://podjem2.club/income_tax_calculator_using_form_16iw21t.pdfIn PDF document text
    • https://cdn.sqhk.co/fepexeguma/hjjajjE/hand_tossed_vs_handmade_pan_vs_brooklyn_style.pdfIn PDF document text
    • https://wikabolodaj.weebly.com/uploads/1/3/4/6/134648749/zatemo-welogidetu.pdfIn PDF document text
    • https://cdn.sqhk.co/topazawu/jbrEnIm/marajogazudokebuzesaf.pdfIn PDF document text
    • https://vugawijop.weebly.com/uploads/1/3/4/5/134594760/e7f751a64.pdfIn PDF document text
    • https://dipilewojariwu.weebly.com/uploads/1/3/2/8/132814651/3f44eaae58b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422134/normal_5fe487b67fbf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393508/normal_5fd9f47ee55a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450243/normal_5ffcd0605dafa.pdfIn PDF document text
    • http://saleproducts.pro/99363771648nzf7h.pdfIn PDF document text
    • http://demask.fun/turegeginifojejevugebenm7jb.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/xovajukoxin/free_whiteboard_animation_software.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/android_messages_app_font_size.pdfIn PDF document text
    • http://vimobuzu.epizy.com/89006135198.pdfIn PDF document text
    • http://vewomani.rf.gd/magifidinezeku.pdfIn PDF document text
    • http://xupudajiwozov.epizy.com/51023899703.pdfIn PDF document text
    • http://xamipekuxedatif.rf.gd/91283184715.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_off0000e06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06E 5492 bytes
SHA-256: df32dccf9a9846db61622564cc9166d53448643651e14125d63dff9138420d58
font_01_sfnt_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 10052 bytes
SHA-256: 5ebaaea6c711c5d62d1bc8357a8b0da6ef7e0949189908f85e7d3091776ba565

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