Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9406c7388b0674e…

MALICIOUS

PDF

104.2 KB Created: 2021-04-04 15:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 653f0b815c256c0b02c72d505ea4fa9a SHA-1: 8ba25e2f66f6abcfb0b55febc4c3b924f8cb1557 SHA-256: a9406c7388b0674e55d34918f80011624104db2d67c6086e28e39d09bea2f518
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The primary URL, https://xajibur.ru/strik?utm_term=introduction+to+machine+learning+with+python+a+guide+for+beginners+in+data+science, suggests a lure related to machine learning. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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://xajibur.ru/strik?utm_term=introduction+to+machine+learning+with+python+a+guide+for+beginners+in+data+science PDF link annotation
    • https://mevemedetu.weebly.com/uploads/1/3/1/8/131871578/9a4174603214b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374686/normal_5ff8ce41033b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489722/normal_5fd9163477a5c.pdfIn PDF document text
    • http://bexowobiminefi.mywebcommunity.org/46471912330.pdfIn PDF document text
    • https://megoximigiwuboz.weebly.com/uploads/1/3/4/5/134579220/2980246.pdfIn PDF document text
    • http://tuxesimufimiti.mypressonline.com/electrical_engineering_mcq_questions.pdfIn PDF document text
    • https://nedotumawu.weebly.com/uploads/1/3/4/6/134626041/ruduwit.pdfIn PDF document text
    • http://mesutilixuta.sportsontheweb.net/74135579082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413373/normal_6025a4e3ad6e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447267/normal_604f4b5147264.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/apexification_review.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/vokeri/chemistry_test_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dd1a026-aa4f-4118-b941-10fb7e3739f9/fupog.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/zurigisugeguwav.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/military_mental_endurance_180_day_bodyweight_beast_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/d_and_d_dice_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/bible_commentary_book_of_ruth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bc03532-9f70-49be-a27b-d56da7773cd9/how_to_reset_the_toner_on_a_brother_mfc_l2710dw.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/how_much_does_a_small_square_bale_of_straw_weigh.pdfIn PDF document text
    • http://bafuwujix.atwebpages.com/47491769585.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/tosutekupidanuguvo.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/cours_d_allemand_pour_dbutant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6b1fd0e-807d-4473-a1fc-ec62fdf6dab0/cant_log_into_hitron_modem.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_off000157de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157DE 5840 bytes
SHA-256: fd8269b07dc87dbae71b53220353de9fbe7612fc6bfb7e78f8197aceb563b67e
font_01_sfnt_off00016ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BA8 11376 bytes
SHA-256: 853d14cfc4d70623fb37eda07976fd74916e23a266f24b2f8e23cc2c895ae8bc

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