Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36bdea55cc2c184…

MALICIOUS

PDF

76.6 KB Created: 2021-03-01 03:39:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6057c641d0dfb2b557b7fc36aa3a5c37 SHA-1: 5414e831dd64b80fe5f9aea6a6357a88a3eb106d SHA-256: b36bdea55cc2c184522ab046ea345fcab0438727e6a70fa8f4bb9fcc44c78cd8
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 0.9997

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://mezovuduw.ru/123?utm_term=the+skin+i%2527m+in+summary+chapter+5 PDF link annotation
    • https://cdn.sqhk.co/xitilesuxiw/rhi06gj/sweet_home_story_mod_apk_unlimited_money.pdfIn PDF document text
    • http://wupupetobuzune.22web.org/xesazo.pdfIn PDF document text
    • http://getizibibi.22web.org/vocabulary_words_for_4th_graders.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sapidobilebag.epizy.com/injury_report_patriots_vs_packers.pdfIn PDF document text
    • http://nelixosixumev.epizy.com/mofenawa.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/avery_templates_labels_60_per_sheet.pdfIn PDF document text
    • http://newosanovaf.epizy.com/14519593345.pdfIn PDF document text
    • http://puzenufamem.rf.gd/how_does_cleric_spellcasting_work_5e.pdfIn PDF document text
    • http://domidezoraz.epizy.com/nuzado.pdfIn PDF document text
    • http://gefuxexo.epizy.com/newovixukuv.pdfIn PDF document text
    • http://fuxumapumumubif.rf.gd/damujuxuvuzadet.pdfIn PDF document text
    • http://gexijefepawu.epizy.com/53940296063.pdfIn PDF document text
    • http://buvelijixuzumu.epizy.com/64170041349.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/apology_email_for_sending_wrong_information_sample.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_off0000e095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE095 4280 bytes
SHA-256: b1697281b7abf4e6cfed9171a8d1f106637b7bc66a2ff2cbb5c9d98f3402b9a5
font_01_sfnt_off0000ef9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9D 5412 bytes
SHA-256: 8b030f80371744a2e6e2af152474b96fe5882eb5f46f1a8951a4414b7d9709fa
font_02_sfnt_off000101e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E9 10260 bytes
SHA-256: f7f16ef407aba73f71ca2fa02385f5e2a296e837edc1fba0f25db370fc323db6