Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac094692e51aa37b…

MALICIOUS

PDF

42.9 KB Created: 2020-10-26 02:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2093e447647f90c3a5142fcf25a6a59e SHA-1: 992738e1e9b50c7fa06e4fe7e54e3835b75b0db4 SHA-256: ac094692e51aa37be7c63ba0589f07b20c3892e1392842d5594827087ed7ab89
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to legal acts and also includes the malicious URL, suggesting a lure to trick users into clicking. The presence of many external PDF links further indicates a link farm or SEO poisoning attempt to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://cctraff.ru/123?keyword=coroners+and+justice+act+2020+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376379/normal_5f89db80e17d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373240/normal_5f8a08d8d3b3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_5f8b689740a4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5f8851158753d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367273/normal_5f9256ea0f61d.pdfIn PDF document text
    • https://sewiwojura.weebly.com/uploads/1/3/4/3/134371681/koseb.pdfIn PDF document text
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/9249274.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/tubabubexevuwefobate.pdfIn PDF document text
    • https://fegikunula.weebly.com/uploads/1/3/4/4/134482285/gapiruxuferonak-nigujaxilisevik-sesivom.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/fasanag/rumination-_focused_cognitive-_behavioral_therapy_for_depression.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/feruzuviletezisupula.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/38749811504.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/xukazukomepalogu.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/77977254783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22455c93-d1d7-4e4c-bc4c-550086c909b1/kitemexajomadujapemutavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4540e321-c219-4fc4-a247-8b490087c296/piwebilofeko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b395b1d-75ae-47a4-b3f4-8e66ba5f6b09/wonderdraft_download_cracked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/357e5cb9-affb-4467-845b-d53fa3b6a0af/subacute_combined_degeneration_usmle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4160cd7-9207-4dc5-82f5-b449a3f4081c/54736502151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0b8c91d-a905-4c57-9f29-7e272d565939/bevuguwujoniwulor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b6ef2a3-9286-4ae6-ab89-2abc6a1363d8/nursing_process_book.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_off00006854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6854 5372 bytes
SHA-256: 3cbec16847a23434963bcebd531836e0b6d30071dff335017c36e9d30d8a277a
font_01_sfnt_off00007aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AAA 10472 bytes
SHA-256: 7abd4f55de25434bdeb59022322720932bc3a538957da205e77710fce62698dd