Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f07ce81de8d19ee…

MALICIOUS

PDF

80.5 KB Created: 2021-05-17 02:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: dbe268cc8db4e5d4b3d79787e3758c9d SHA-1: 2876f47575a2ff3d6d2a03b2659c5c8ff0fbb78d SHA-256: 6f07ce81de8d19eeb66f56adac0731810cb77e15d1ce314eac5ffb30cc4c7a9e
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many of which are SEO-optimized and lead to redirectors, indicating a link farm or phishing attempt. The primary malicious URL identified is https://nipisod.ru/strik?utm_term=briggs+and+stratton+6.5+hp+engine+ignition+coil, which is likely used to deliver a payload or conduct phishing. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, possibly involving embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://nipisod.ru/strik?utm_term=briggs+and+stratton+6.5+hp+engine+ignition+coil PDF link annotation
    • http://kelnoteres.xyz/dobezipedurivinenezuduxowh2e4.pdfIn PDF document text
    • http://form-lnstagramcopyrightservice.com/power_cooker_pressure_cooker_troubleshootingkprkv.pdfIn PDF document text
    • http://telgrm.site/hunchback_of_notre_dame_book_8_summarywk6zh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497646/normal_60006f3b44338.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/75702558234aaqsy.pdfIn PDF document text
    • http://obuv-kozha.ru/importance_of_being_earnest_script_act_13z94v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450158/normal_5fe198fb1621e.pdfIn PDF document text
    • http://ultra0.space/lidubowajodesuom9cz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462350/normal_606452accf5d6.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/tuzamada/waltz_for_debby_lead_sheet.pdfIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_32cfe7c6d0c6472c9f32fc47d0d8cbd8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/putelekireza/redinimevadumojiribamu.pdfIn PDF document text
    • https://507f79ed-2408-4027-b124-45ed49bded7d.filesusr.com/ugd/2de61b_0b058bf96dac4a7baf2c7511a86b380f.pdf?index=trueIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_eee146ff0a1f4a24b2b95c38829aa292.pdf?index=trueIn PDF document text
    • https://c1ab63b4-4781-4901-abeb-f581ed41d26f.filesusr.com/ugd/b44917_37115ee55dcc4ffe945bcda1f98adf78.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tulosa/nurse_uniform_dress_code.pdfIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_b458ba024d0146e4b93d7f211ecc6861.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lunojol/genius_g3500_lights.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/promissory_note_form_for_real_estate.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_off0000fdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF0 5696 bytes
SHA-256: c4457d693979340099e28e7a722343648c47b3b4bc64d8f1d3950ddb245513b8
font_01_sfnt_off00011155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11155 10232 bytes
SHA-256: 4cc62413d0aeb779130649d9dccbb04d9b57ef3df886c69fea6c91fbe7bc8be6

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