Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ec28bc1af5d37e…

MALICIOUS

PDF

80.5 KB Created: 2021-04-08 02:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dd6da2e9a96c023dad763f2349f6dd37 SHA-1: 5dba95b316392b5192607ec82dc066124f20574c SHA-256: b1ec28bc1af5d37e97ed529816b3168a63be12cdb8645f5707a3e74ec61ace98
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://vilenefex.ru/123?utm_term=businessman+telugu+movie+video PDF link annotation
    • http://davilebut.66ghz.com/house_rental_agreement_template_word_malaysia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://b23ebcb4-2e41-4c68-a408-584c84124782.filesusr.com/ugd/5a2446_e6acb5c06e274847848bf41b8f9bf963.pdf?index=trueIn PDF document text
    • http://zulorokufejepa.rf.gd/whistleblower_transcript_document.pdfIn PDF document text
    • http://nifupexev.rf.gd/22138234361.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/192ff7f6-1f61-4e4f-a61c-ccb38d248078/ethical_hacking_course_free_download_in_hindi.pdfIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_be35ad221deb425cb9868876d48e5313.pdf?index=trueIn PDF document text
    • http://baledur.epizy.com/chahun_main_ya_na_lyrics_video.pdfIn PDF document text
    • https://761e60ea-5e0e-4c43-b4c2-f6a9045c608d.filesusr.com/ugd/545033_e3fe8d62eb0e47afbbfd8363256d2e19.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a22a27af-8c60-4841-8d6a-068c19263a7e/best_dd_dms.pdfIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_91c84835eb32418aa9a792fc67e39c4f.pdf?index=trueIn PDF document text
    • https://c22e5cf4-338a-4003-9cad-c1cb0be29285.filesusr.com/ugd/3db607_10c58568acd943dc8130dfa99980df58.pdf?index=trueIn PDF document text
    • https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_dc483c2a8c7d4529b5f93774ed16abf6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8be2a39c-e682-4373-8bd1-1c37f77787b1/how_to_factory_reset_a_samsung_soundbar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f45150da-31c9-402d-bdc2-0c4fd173f2c7/maths_basic_skills_worksheets_answers.pdfIn PDF document text
    • http://tizepadeda.rf.gd/wefutisumus.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 5040 bytes
SHA-256: 646fd9b3f45487eb214e9ed857d848798c4820401a66a3b862aeeacbcf5eea48
font_01_sfnt_off0001024c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024C 10756 bytes
SHA-256: 44fc108dccd6312877f6930dfaf09a2318bf3434adfe7fa08fa1cab4ae8c91f5
font_02_sfnt_off000126e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E2 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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