Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa2e83dda92e754…

MALICIOUS

PDF

75.2 KB Created: 2021-03-29 02:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 32d43a6e956b5924b3e04acb3a889419 SHA-1: c8ed53cd327159b6627fd8e31f9626391ea26e35 SHA-256: faa2e83dda92e7543475bbcab9f7e745232ec991a552c983a396cbf7caf83e13
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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/award?keyword=excel+tutorial+for+beginners+2020+pdf PDF link annotation
    • http://nenugatigubom.66ghz.com/vba_variable_as_worksheet_name.pdfIn PDF document text
    • https://jakipafowikodo.weebly.com/uploads/1/3/1/0/131070805/momegaxom_nufeniwu_lamubejotodal_lulufetokujoteg.pdfIn PDF document text
    • http://gudokav.sportsontheweb.net/antiacidos_en_embarazo.pdfIn PDF document text
    • https://wogizepi.weebly.com/uploads/1/3/5/3/135388010/7587200.pdfIn PDF document text
    • http://nenikilezam.22web.org/what_is_the_most_popular_name_in_2020.pdfIn PDF document text
    • http://lukezelulevuf.22web.org/foloz.pdfIn PDF document text
    • https://jubibesu.weebly.com/uploads/1/3/1/3/131379113/pexegaxeteka_gazixowitib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://midusetoz.epizy.com/what_is_step_4_in_aa.pdfIn PDF document text
    • http://giratas.epizy.com/puredafefutorodefob.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/chroma_key_video_software_for_android.pdfIn PDF document text
    • http://dotopaku.atwebpages.com/estudio_biblico_de_la_oracion_del_padre_nuestro.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/53817233522.pdfIn PDF document text
    • http://pewavifasovifuz.epizy.com/39807005869.pdfIn PDF document text
    • http://vejimugar.epizy.com/bubble_sort_c.pdfIn PDF document text
    • http://tibupud.epizy.com/jutekavajasefufaz.pdfIn PDF document text
    • http://losikamadan.epizy.com/bijokej.pdfIn PDF document text
    • http://lajoxugulip.epizy.com/73394339791.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/contrato_de_anticresis_bolivia.pdfIn PDF document text
    • http://kesajuwigiferu.epizy.com/73462091670.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_off0000e83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83D 5760 bytes
SHA-256: f166a0278e1826d316d393b826e11e2dc8589836c0e65e47ea1ce41a13651572
font_01_sfnt_off0000fbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEA 10384 bytes
SHA-256: 212d4927c13af6ac4fa581864edb2d9dc8aa0c5bd733d0d04a7456e44c39835e