Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19c8b1ec2a57a4d…

MALICIOUS

PDF

85.0 KB Created: 2021-03-25 14:30:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4f043986b22d756126bd1c4e327c0532 SHA-1: 17b3972ecaef5b31d6eb397ef0284cd6faeb0cec SHA-256: a19c8b1ec2a57a4da0bd9d5ff2dfe24ca341056fb58ce1475b2b5f869073700e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • 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://gimoguvi.ru/wix?keyword=razor+scooter+e300+owner%2527s+manual PDF link annotation
    • http://xasuxugadivusug.22web.org/16796665936.pdfIn PDF document text
    • https://cdn.sqhk.co/wedekimelol/7jbI2gc/kozewikovafazofirifanume.pdfIn PDF document text
    • https://cdn.sqhk.co/puroneruk/3wifSge/free_recharge_on_idea_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/xibumediw/KhhaBc6/class_10_maths_solutions_chapter_11.pdfIn PDF document text
    • https://cdn.sqhk.co/domuduxuro/UhjgjOd/understandable_statistics_12th_edition_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_aec0c0caa6154a48abc2429dc5ef8af0.pdf?index=trueIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_14a0b8f4cfbe405f916ecc8674ccd2fc.pdf?index=trueIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_32bf9edb5e494b9a9c1a7beabc979ccd.pdf?index=trueIn PDF document text
    • http://paradubufaxeju.rf.gd/25889714374.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c5ce731-ddbc-40ea-aa55-a7ee56e20290/how_to_reset_marantec_m4500e.pdfIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_7f747e0e2e6e442b93b24f262d0594f5.pdf?index=trueIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_a26da1beda6b42f8aa36c0dc96a76527.pdf?index=trueIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_5b1e4632eeca4c589ba25f0b13d64c5f.pdf?index=trueIn PDF document text
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_e0d62979c5c34b95b499c80a02838106.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57fa6520-30f7-40e8-bb8c-13f7df7876cb/gidolupuxuxowofegaxot.pdfIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_222368de90504d17b64bfc8b0f4fd1f2.pdf?index=trueIn PDF document text
    • https://b4f37643-5dcf-4f7e-b18d-33dfadc922ee.filesusr.com/ugd/2d797c_3b2ec8f216134e898f4bfccfc80e8e17.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/14bf9ec3-d25c-497a-adaf-ce23aa7b380a/30668098836.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_off00010866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10866 5432 bytes
SHA-256: 5bc59f8f1f6ee402444b394f37764dd42afd102d02370b0c6aa5eab99d3ab494
font_01_sfnt_off00011af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF1 12592 bytes
SHA-256: 6d8a1530cc8be365868e94b8ef5493fed4e400ebcda0342b9d9fe4a040eee453

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