Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52df87e390d0733…

MALICIOUS

PDF

78.0 KB Created: 2021-04-21 23:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6538281bdc61b1afcece5a81fb6dd363 SHA-1: a7b04715c0a616c0db7f6d04f853698a8079c537 SHA-256: f52df87e390d07335662f448d5382e856eb5e152a8257379ea93c2a780551fd3
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 0.9993

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://jumiwimov.ru/strik?utm_term=how+to+determine+spellcasting+ability+modifier PDF link annotation
    • https://cdn.sqhk.co/wanadujogo/jSrjhge/jelly_fruit_slices_candy_calories.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/YCUieig/mini_glider_paper_airplane.pdfIn PDF document text
    • https://xukoxaxap.weebly.com/uploads/1/3/4/7/134748194/mamab.pdfIn PDF document text
    • https://cdn.sqhk.co/vidikusupegu/hfkiaje/xajevabasujivone.pdfIn PDF document text
    • https://cdn.sqhk.co/bejadelu/jtdjdGT/vidiza.pdfIn PDF document text
    • http://segilajobugulof.iblogger.org/alphanumeric_codes_in_digital_electronics.pdfIn PDF document text
    • https://gipasutojemozup.weebly.com/uploads/1/3/1/3/131379868/gamugivalix.pdfIn PDF document text
    • https://cdn.sqhk.co/sozovifena/gdCd8hc/9692782196.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/igifVja/379930867.pdfIn PDF document text
    • https://cdn.sqhk.co/xazururoxe/l7p23gg/pusim.pdfIn PDF document text
    • https://cdn.sqhk.co/vagizabibo/yQijHfO/conquest_scents_evercalm_reviews.pdfIn PDF document text
    • https://wimelavejitovuv.weebly.com/uploads/1/3/4/5/134597731/6061508.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/djfjhgg/hangman_s_fracture_symptoms.pdfIn PDF document text
    • https://cdn.sqhk.co/faruzikako/hioOchi/82526076126.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/c86fca93-d541-48a8-a2c7-913ed43057e3/what_is_the_most_anti_inflammatory_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebc33f1e-4b2e-4dc7-8bd5-def5968d70c7/wugozarorum.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/90475103020.pdfIn PDF document text
    • http://lizugerij.epizy.com/introduction_to_data_science_ucla.pdfIn PDF document text
    • http://mawunodopijosa.epizy.com/mortal_instruments_characters_hogwarts_houses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e40c50f-b22c-4cc0-8296-3c98fc9bd230/genume.pdfIn PDF document text
    • http://xunonevikonog.rf.gd/appsc_group_1_prelims_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/7848264497.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/cast_sql_server_date_format.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_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 5768 bytes
SHA-256: d96b8ea6bb4cb02266de624f6cf97c7165bf2ec6618ccb031df49734d2df998c
font_01_sfnt_off000106ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EE 10528 bytes
SHA-256: 4ec3bad98c9f136a7b22bf59a9094cea2edd4b9afe37bc1613587e6c944ccec4

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