Malicious PDF — malware analysis report

Static analysis result for SHA-256 a144096b0564f445…

MALICIOUS

PDF

71.0 KB Created: 2021-02-23 22:43:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 921b2276b406f1b8ee8ffdf23d52b45e SHA-1: ff41489ea877fa0410594a2f19838532fc5d4ce0 SHA-256: a144096b0564f44522f48280bf1467f6ae2820f8b76a2f5be8a62533782beabd
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high number of embedded URLs, many pointing to disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external URIs suggests an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=how+much+sugar+is+in+the+new+dunkin+refreshers PDF link annotation
    • http://insta-sale.site/the_explosive_child_worksheet6cgoo.pdfIn PDF document text
    • http://betmoy57.com/xipuw228xk.pdfIn PDF document text
    • http://dekoratifazanu.22web.org/962266876.pdfIn PDF document text
    • http://lienforkid.com/nortel_m3904_programming5s5m2.pdfIn PDF document text
    • http://item-get.top/bamaparovanovuuhlfw.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/cvGK11s/73569762317.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494160/normal_5fcea15070c12.pdfIn PDF document text
    • http://botumudasotap.iblogger.org/lujajijovivuwexumepir.pdfIn PDF document text
    • http://manekobe.22web.org/book_ka_full_form_kya_hoga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kivekovojador.epizy.com/artificial_intelligence_tutorial_c.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/77219727992.pdfIn PDF document text
    • http://nobufep.epizy.com/bmw_step_auto_or_manual.pdfIn PDF document text
    • http://bopufadepop.epizy.com/is_benue_state_polytechnic_form_out.pdfIn PDF document text
    • http://fofanab.epizy.com/47176729992.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_off0000d727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD727 5520 bytes
SHA-256: a301baa7e15e5ddb0a26404fc60a60d9ccd7d8b4096311d301235ba3684d0ca8
font_01_sfnt_off0000e9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D4 10876 bytes
SHA-256: 7afdabcaeba33c3bc85b171433874cd301175df54a2de7b403cebbe2131d0c1c

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