Malicious PDF — malware analysis report

Static analysis result for SHA-256 685618aa4e8d9f96…

MALICIOUS

PDF

79.7 KB Created: 2021-04-18 11:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 674596dc64cadc759f52660e5962e131 SHA-1: d9a2beb33e27a103e7b746ebe6fdb66e1629887e SHA-256: 685618aa4e8d9f9672a21814cda7557e24c0520a47fb4099cfa410ace576b587
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO link farms to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary URL, 'https://botokaw.ru/strik?utm_term=how+to+program+homelink+rolling+code', appears to be the main destination for the link farm, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://botokaw.ru/strik?utm_term=how+to+program+homelink+rolling+code PDF link annotation
    • https://cdn.sqhk.co/kutajanode/0NgjRio/capstone_definition_bible.pdfIn PDF document text
    • http://biditudoti.22web.org/all_about_me_worksheet_kindergarten.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/hDwgfgd/79108498738.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/iajfpQU/liwisinudaxisegevemotamo.pdfIn PDF document text
    • https://cdn.sqhk.co/jigidokasaga/idMhbgi/64891182516.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/wHNXshc/nofatemokogos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbcd689b-c907-49f5-a310-1b5a3ef94683/bijupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/532588bd-18f6-4420-9669-eca02b08130b/wopilivorotipovuwoxisu.pdfIn PDF document text
    • https://da9d63b4-fbfd-4f6f-88e7-06ac0d76355b.filesusr.com/ugd/ca300b_d2ae2906777044e8ab56f37352e1893e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4809f21f-1cec-42ba-92c3-9b84197a6bb7/73782434832.pdfIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_2ef6f1d513114452b06b27b34eef5eed.pdf?index=trueIn PDF document text
    • https://a35b4eae-300a-44a5-b982-8d633984e519.filesusr.com/ugd/19735e_81cac91e50254a4d8ebddbf75cd713b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57f35ae7-50b3-488e-83ec-43dc9eeb021d/soluduzikubafeb.pdfIn PDF document text
    • http://fowudunomus.epizy.com/limiting_reactant_and_excess_reactant_worksheet.pdfIn PDF document text
    • http://momoxorepuvo.epizy.com/2017_annual_franchise_tax_report_delaware.pdfIn PDF document text
    • http://tagenujipitedep.rf.gd/promotion_of_bantu_self_government_act.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d234c8a-8f8c-4a59-b3be-343445b2a686/husky_power_washer_1750_psi_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5d44dff-98ba-4016-9199-24cec707d857/vegetarian_meals_for_weight_loss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6fd8a0b-8268-4afd-9179-aa6532b8ec0f/69369994612.pdfIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_a5ed7adb44ca4a67af8e94d73fe1b5e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d0d14d7-57f1-4248-a151-e5851ed9885b/how_to_pair_ue_megaboom_speakers_together.pdfIn PDF document text
    • http://vigadibomo.rf.gd/les_miserables_movie_epilogue_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e9bd61-fabd-4d9f-8fe4-0ac6037a6041/red_rising_book_chapter_summaries.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_off0000f924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF924 5424 bytes
SHA-256: 9a2985f187aa85b425f69782d759f6f7e2e791894636318bc63449a396226efd
font_01_sfnt_off00010b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7D 11268 bytes
SHA-256: 8ca02697bb37c04fee2c84db1a1d1caabbb56f92e9892e40cc1e30d7a8bca6aa

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