Malicious PDF — malware analysis report

Static analysis result for SHA-256 c674db97ae5fe187…

MALICIOUS

PDF

83.3 KB Created: 2021-02-19 19:50:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a9c7efc3fecf35c1943e971da88a3bcc SHA-1: 99092544a001582061d768e01ddf0dabee398101 SHA-256: c674db97ae5fe1879158ff8c473c84b6b210e21e58a18e692da0bffb396ea10f
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical alert for redirecting to known malicious infrastructure. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=bill+nye+structures+worksheet+free In PDF document text
    • http://markettop.pro/41389937889kmho4.pdfIn PDF document text
    • https://tigerabedudutid.weebly.com/uploads/1/3/5/3/135304069/zepeborupa_zipulupegenidi_xabubi_sejixivafiliwe.pdfIn PDF document text
    • https://cdn.sqhk.co/sotisibu/gdFdjiz/wugixinosajutado.pdfIn PDF document text
    • https://kajizifobizixa.weebly.com/uploads/1/3/3/9/133997117/wewojekuvofajoxurus.pdfIn PDF document text
    • http://ig-copyrightviolation.com/noruglkxuy.pdfIn PDF document text
    • http://zoo-taxi.site/tobexiturazilalopowiwuvojkfu3.pdfIn PDF document text
    • https://cdn.sqhk.co/perokokamosa/m0Wa7id/capsaicin_cream_0._025_en_espanol.pdfIn PDF document text
    • http://ooovseanalizi.ru/3478910029600mpi.pdfIn PDF document text
    • http://antonio-ita.space/limiting_reactant_and_percent_yieldv8eac.pdfIn PDF document text
    • https://ligibokone.weebly.com/uploads/1/3/1/8/131858045/semirotedarixo-xurid-peradalu.pdfIn PDF document text
    • http://mscgis.net/biological_classification_mcq_for_neeta24s0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/paxunu/convert_to_word_automator.pdfIn PDF document text
    • http://nimunofat.epizy.com/p._b._u._h_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/plataformas_lms_almagesto.pdfIn PDF document text
    • http://jojudodadanu.epizy.com/newspaper_article_structure.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/meramec_springs_fishing_report.pdfIn PDF document text
    • http://pujifobekef.epizy.com/venajutowilewubade.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_off000100f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F3 5064 bytes
SHA-256: b787c8ff811e079d977d20fa682c401303040c7b693a60a79c1a723816d133f2
font_01_sfnt_off0001124b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124B 14344 bytes
SHA-256: 10f6c0ac49b22b74217aed57f502520dec054ec0a8eb8543ecf72f8e99f33cdf

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