Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ba0480de6266ba…

MALICIOUS

PDF

133.3 KB Created: 2021-04-06 20:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b7b8848d92ebb3d47d681cc9f493ccda SHA-1: 71a8f036f08274a8b5cf37ef447eeffaf45bed47 SHA-256: d2ba0480de6266bacb5d7b5d3510e09978fd7e8cd6238cd2a3d6e89ee1f2de19
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 0.9981

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://fokemale.ru/award?keyword=codex+skitarii+v8+pdf PDF link annotation
    • http://vuxipoxo.22web.org/96824421541.pdfIn PDF document text
    • http://good-production18.site/gy6_engine_losing_powerlq5a4.pdfIn PDF document text
    • http://skidki-day.store/whos_afraid_of_critical_race_theoryniigr.pdfIn PDF document text
    • http://tebogekememesij.mygamesonline.org/brand_equity_thesis.pdfIn PDF document text
    • http://detaxinema.22web.org/possessive_determiners_worksheet.pdfIn PDF document text
    • http://juzezudusota.mypressonline.com/biblioteca_catolica_digital.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/25098627368.pdfIn PDF document text
    • http://fafuzum.sportsontheweb.net/php_array_functions_with_examples.pdfIn PDF document text
    • http://bnatural.space/psychology_schacter_second_european_editionxxw73.pdfIn PDF document text
    • http://zunololanuxigu.sportsontheweb.net/economist_download_free.pdfIn PDF document text
    • http://koponegigat.medianewsonline.com/yaesu_ft-2900r_operating_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422628/normal_602d7f7eeed46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410016/normal_606bd98a737eb.pdfIn PDF document text
    • http://fedexonep.mypressonline.com/46975245196.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.fontrix.comhttp://www.nhncorp.comIn PDF document text
    • http://wifobujaxude.epizy.com/sorting_algorithms_in_c_download.pdfIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_80453646311540cb99347be6bad778c6.pdf?index=trueIn PDF document text
    • http://jetubomubiko.epizy.com/64067587635.pdfIn PDF document text
    • http://renureva.epizy.com/27691853846.pdfIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_32716f6dc25c4b99b4da7a2c3d22eb18.pdf?index=trueIn PDF document text
    • http://givetupazowo.onlinewebshop.net/38253338803.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001d4f6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1D4F6 16756 bytes
SHA-256: a23ab1317b7c8531443eb22ca7142f39fe9d438843a14ad54fb685425fc065c8
font_00_sfnt_off00016281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16281 3588 bytes
SHA-256: fd2c662e3abfa701afe9b51b6b4848e5db94968b60085d8f01e818380258ddd1
font_01_sfnt_off00016f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F64 5292 bytes
SHA-256: f24042927ae0276f81d974d56988d1007546d2656be524aa7db48e448157ae9b
font_02_sfnt_off0001817c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1817C 32132 bytes
SHA-256: c0517f30a5971356bc67c488353c532356d2e9459c2fd286d7cfa025ad92129e
font_04_sfnt_off0001ec60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC60 2180 bytes
SHA-256: 2fa2e5661f8b9f9dc5a6c80dca7beb6d63ebe858b0f9e284ee75e740b5d78789
font_05_sfnt_off0001f58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F58D 6168 bytes
SHA-256: 87c3156f62d7909d32e71fd14d6a093fb0def707f9d779124bb0d8814c53d64b