Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca10927eb94f8a44…

MALICIOUS

PDF

84.3 KB Created: 2021-04-05 14:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7fdaea75ab81d3c99f575bc712eaa7c1 SHA-1: 0896644f8c0480b57462fbcf6410d9d69e4c9abc SHA-256: ca10927eb94f8a4478650e4b10131ce23cd9b5a8eef6006cfccd9c847b680a6c
126 Risk Score

Malware Insights

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

The sample is a PDF file that contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'trigonometric integral tables' to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://xajibur.ru/strik?utm_term=tabla+de+integrales+trigonometricas PDF link annotation
    • http://divebelas.iblogger.org/gizexigu.pdfIn PDF document text
    • https://butusokusumowa.weebly.com/uploads/1/3/5/2/135294155/3379839.pdfIn PDF document text
    • http://pop-marketplace.ru/dentures_and_demons_guidevgcos.pdfIn PDF document text
    • https://rizegenaw.weebly.com/uploads/1/3/4/1/134108854/bobarominopi_savaweledibix_kenes.pdfIn PDF document text
    • http://berkeciftci.net/niranipugajufijoxekinukibqfsgu.pdfIn PDF document text
    • https://gepemizuwawufak.weebly.com/uploads/1/3/4/3/134335313/nedodavi.pdfIn PDF document text
    • http://ejqy.com/how_to_know_if_my_motherboard_supports_8gb_ram81j8b.pdfIn PDF document text
    • https://gavizixuf.weebly.com/uploads/1/3/5/3/135334805/650497.pdfIn PDF document text
    • http://ingmijn.com/english_synonyms_and_antonyms_dictionaryz1g87.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kumugirenukelil.epizy.com/25593450024.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/command_prompt_commands_to_speed_up_computer.pdfIn PDF document text
    • http://tovigozi.rf.gd/bebotixadadetem.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/clover_kanzashi_flower_maker_craft_template.pdfIn PDF document text
    • http://nakepusigazu.epizy.com/wonajadafevi.pdfIn PDF document text
    • http://kokulokigebowow.rf.gd/48799586665.pdfIn PDF document text
    • http://beturatigamoli.epizy.com/example_of_grading_sheet_in_college.pdfIn PDF document text
    • http://mubidixosi.epizy.com/37052415688.pdfIn PDF document text
    • http://gugevifuvonavir.epizy.com/38873741831.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/libros_sobre_minimalismo_en_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/59913400133.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CB 5348 bytes
SHA-256: c1b2aab2c5332a027052592b922221059962dbf9cbf7cedaf35871fc48464fca
font_01_sfnt_off0000f7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 2204 bytes
SHA-256: a704d7cd687863c6f57e745e0010e6d8c55d6d1060b95ef83726348e5036d066
font_02_sfnt_off00010154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10154 12916 bytes
SHA-256: bbcbf25eb0110d8d07ac2b46d7458bba1db328c77b694f034dc2ab93303b4f35
font_03_sfnt_off00012bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD1 16308 bytes
SHA-256: f2df1802e1e297e4f6b7dc04c8de50a94a8212249e72cc8d82deff96e06f5f54

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