Malicious PDF — malware analysis report

Static analysis result for SHA-256 1539a7c366a6022f…

MALICIOUS

PDF

97.2 KB Created: 2021-03-13 19:37:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ea5c03bda82a4bdeeff9b1d3cea074a7 SHA-1: 39203851c97d2aba797ebf83f5ef9957f12a88ba SHA-256: 1539a7c366a6022f4069b40e3b7aa0533e446ab6b33aa375f3207e08277e55a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9991

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://pelibifir.ru/award?keyword=technical+data+sheet+example+pdf PDF link annotation
    • https://xatuzagu.weebly.com/uploads/1/3/0/7/130738971/kemawidanus_lerewenafe_zavuxitewarin_rafasibosidato.pdfIn PDF document text
    • https://nagajaburelu.weebly.com/uploads/1/3/2/7/132740350/9501343.pdfIn PDF document text
    • http://divoposolabuv.22web.org/adding_and_subtracting_real_numbers_worksheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/4heQhgN/10397444393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413242/normal_60126d3665962.pdfIn PDF document text
    • https://cdn.sqhk.co/gulanuwe/bk5XXhb/51202755948.pdfIn PDF document text
    • https://fumaletaseker.weebly.com/uploads/1/3/1/3/131381433/6970355.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375884/normal_5fcdaec51eb81.pdfIn PDF document text
    • https://cdn.sqhk.co/madilaxetevo/gTRFJah/midoriwefuziz.pdfIn PDF document text
    • https://cdn.sqhk.co/pifizumux/jjkWFhd/gaming_wallpapers_app_download_for_pc.pdfIn PDF document text
    • https://gekuraneg.weebly.com/uploads/1/3/1/6/131637503/gotilixuf_moriro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495988/normal_5fedf40c02336.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://uploads.strikinglycdn.com/files/e3a40fa1-5c77-43ac-aa64-c213941581bb/computer_networking_a_top-down_approach_featuring_the_internet_8th_edition.pdfIn PDF document text
    • http://ribulobelirebu.epizy.com/suntrust_bank_mortgage_address.pdfIn PDF document text
    • http://jisufosesuku.epizy.com/learn_selenium_webdriver_with_javascript.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/122e1dca-1732-4410-8d13-5a309d481c2d/bose_sounddock_troubleshooting_no_power.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/encyclopedia_brown_carries_on.pdfIn PDF document text
    • http://dudakesiburegig.rf.gd/3829370669.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/angular_2_formbuilder_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/diablo_2_lord_of_destruction_cheat_program.pdfIn PDF document text
    • http://mukenoveran.rf.gd/beehive_class_9_chapters.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/broan_elite_range_hood_repair.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/how_can_you_tell_the_point_of_view_in_a_story.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001308e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308E 4992 bytes
SHA-256: b718d2dc4442adc00f9812ea4c12621b666cc376eb18ee67cbf682804999472f
font_01_sfnt_off00014159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14159 11724 bytes
SHA-256: 105a40efe22fab173f063670aaf45a7d22fd6ab1ba9bf5a2a595b060f8de4e69
font_02_sfnt_off00016900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16900 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378