Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a340c8c083f00be…

MALICIOUS

PDF

104.5 KB Created: 2021-04-26 01:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6250155e48250782084ae44c37bd1f58 SHA-1: 2116dd26189d364499ed9711a8868ca1ff98dc55 SHA-256: 3a340c8c083f00be032e68c57c642dca893a7e16e3619f3bd56b13b462a7f1c7
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/strik?utm_term=who+is+the+goddess+eostre PDF link annotation
    • https://tamukatiraf.weebly.com/uploads/1/3/4/7/134766395/8151410.pdfIn PDF document text
    • http://sebevifa.getenjoyment.net/control_systems_engineering_entry_level_jobs.pdfIn PDF document text
    • http://gazedalepi.sportsontheweb.net/reading_and_writing_chinese.pdfIn PDF document text
    • https://cdn.sqhk.co/foxoxaze/IFQhjit/80982988499.pdfIn PDF document text
    • https://lupipoga.weebly.com/uploads/1/3/4/4/134402738/wixudawufegewel.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/ihDDLrW/beli_pulsa_listrik_lewat_gopay.pdfIn PDF document text
    • http://fakts.design/fuzaposurapawiwabig62a0v.pdfIn PDF document text
    • http://bostpolamos.site/power_pressure_cooker_lid_replacement519uu.pdfIn PDF document text
    • https://cdn.sqhk.co/sudidoxa/ZF5jgie/25692652512.pdfIn PDF document text
    • https://lufokojas.weebly.com/uploads/1/3/5/3/135398832/mukaferepepuralelol.pdfIn PDF document text
    • http://openplafond.xyz/deciles_grouped_data_worksheetrly15.pdfIn PDF document text
    • https://tagesokute.weebly.com/uploads/1/3/5/3/135315496/fesiviradelaju.pdfIn PDF document text
    • http://sozaxesugoj.mywebcommunity.org/how_to_program_rca_universal_remote_to_magnavox_tv.pdfIn PDF document text
    • http://fejavodexata.getenjoyment.net/9923542590.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_1a0defc268b14a9cbed3e09c886d56d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legenapi/kindergarten_progress_report_card.pdfIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_2194903ad1eb42aaa1a5c74775fbdd1b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tevomenil/how_do_you_become_an_interior_decorator.pdfIn PDF document text
    • https://43a98339-0465-49d0-a416-8cef4780896f.filesusr.com/ugd/89258f_efc378d44c054ac59b5a8e75fa8d1991.pdf?index=trueIn 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
    • 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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0F 8352 bytes
SHA-256: 722c7dc0f3966852c1cf208b725d355882d2efbf0f72a14da2acaebf221eb472
font_01_sfnt_off000142eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142EB 4856 bytes
SHA-256: 6fc8a1f2b4adf3985760c3423c3bd36de96bebb3e5e0bfc13a12bc63d567bddd
font_02_sfnt_off00015379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15379 14520 bytes
SHA-256: 29680b80a33224137e59c23bddffaf1b73a6a5a66708dd1043401168a5a9a057
font_03_sfnt_off00017f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F53 16132 bytes
SHA-256: 0845746d8e0f76c2c57e53a5d0c2d2ba36ed31c4724e2802406f297ba1795667