Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11eb121a5549e5a…

MALICIOUS

PDF

83.1 KB Created: 2021-04-12 14:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d0d9081182ff05a5e666a9888981d414 SHA-1: 10c249da17f39b71fadb494d02064c1dc5afc071 SHA-256: f11eb121a5549e5afe984604e4462a214ad75968abcd54f89319c127b91d961a
186 Risk Score

Malware Insights

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

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 0.9993

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://soxebez.ru/strik?utm_term=spt+humidifier+filter+reset PDF link annotation
    • https://cdn.sqhk.co/xetajikok/lElii6I/21010304137.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/fcNARKa/webakugosek.pdfIn PDF document text
    • https://cdn.sqhk.co/fogunivugame/dhhxo7q/8th_grade_math_worksheets_word_problems.pdfIn PDF document text
    • https://cdn.sqhk.co/viposaxa/ZhhtbB4/lord_of_rock_bands_2000s.pdfIn PDF document text
    • http://fruit-ital.space/sikesubowawosakuzjh7dj.pdfIn PDF document text
    • http://rameautbxy.space/how_to_use_timer_on_g_shockzx4f6.pdfIn PDF document text
    • http://japancar-sib.ru/52154489431hos9f.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/guXieRn/space_invaders_arcade_machine_repair.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/gOiavia/44720836286.pdfIn PDF document text
    • http://onenature.space/tajupinomokauldg.pdfIn PDF document text
    • http://instofficial.online/plato_meno_meaninglxzr8.pdfIn PDF document text
    • http://mikrotikwizard.com/8915078232470am7.pdfIn PDF document text
    • http://a-trvl.ru/baxebepegajejugiwe5uh8e.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://xploitcrew.io/exercices_prfixes_suffixes_ce2j5a0k.pdfIn PDF document text
    • https://cdn.sqhk.co/zabeluzitema/mSYkham/35453281138.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/zuponefi/33572421247.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/29458166475.pdfIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_daf72c8f90f9423eb2a407cebf6d6e6e.pdf?index=trueIn PDF document text
    • https://564fd4a8-0e6d-4f97-813a-a14a70c45316.filesusr.com/ugd/f90d28_4819c15a0b9b4f26aa1233199bb58352.pdf?index=trueIn PDF document text
    • https://1b3e2d6a-0348-4772-9bb2-16e56a761455.filesusr.com/ugd/7bcf02_d0f7fa3e657b4e65a62c9c93e3b0ce1a.pdf?index=trueIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_070e6b7f476e4cae89d1a7a0384ecd11.pdf?index=trueIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_c2faabcc7b6241139ecf978711490144.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/limewub/despicable_me_2_songs.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_off0001083e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083E 5176 bytes
SHA-256: 505f3ba5ffaccf2bf3ec89b46ffb32c29f013086f3203ee62e10c346d74bc4f3
font_01_sfnt_off000119b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B3 10964 bytes
SHA-256: dfbf5aaabe6845b2e4f02b18b33867cd7d967c696c83de55e0f3d99342c3eb96