Malicious PDF — malware analysis report

Static analysis result for SHA-256 69b5aae781c5c00d…

MALICIOUS

PDF

76.6 KB Created: 2021-03-31 14:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ac2f800cb746d34abb3ea723199adc6c SHA-1: 55907cab7e454dd85e9a80aa5147a09fcde43daa SHA-256: 69b5aae781c5c00d94fcb850c7e95fcaade9eea09d24d6973427bf7fcfde9604
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 0.9992

Heuristics 6

  • 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 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://kuzutuzo.ru/123?utm_term=turkish+march+piano+easy+sheet PDF link annotation
    • http://soldatskaya6.ru/82608375845jhluf.pdfIn PDF document text
    • http://prizinsta24.online/denon_x4000_specse68cm.pdfIn PDF document text
    • https://tololomajaju.weebly.com/uploads/1/3/4/4/134472688/3461879.pdfIn PDF document text
    • http://freds.space/coolrom_tekken_tag_freehdhad.pdfIn PDF document text
    • http://bioforcecolumbia.site/54388303136oozte.pdfIn PDF document text
    • https://cdn.sqhk.co/surofowudula/uIjjo9m/pico_question_examples_nursing.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/icibOt3/11891795202.pdfIn PDF document text
    • http://hurleyshamburgers.com/1750008819952c5i.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/fjijaie/renulawinalanobaxodokije.pdfIn PDF document text
    • https://cdn.sqhk.co/nadetajagupe/Rv2giby/payinfinity_a_smart_way_to_pay_online.pdfIn PDF document text
    • https://mafexanilexa.weebly.com/uploads/1/3/0/7/130739060/35e364078e88f33.pdfIn PDF document text
    • https://cdn.sqhk.co/natokaze/c9rhj0q/kelililizutinofizazoxes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_2a0f714a96d04eaf8c6632e22f577bb9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vunizi/17810394505.pdfIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_9aae532037b94a1d9de45788a14d6d92.pdf?index=trueIn PDF document text
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_aece711c4ac84660b06fe3db1dca6104.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/lumoraxurijabizeg.pdfIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_35a5326a978b49679b3fe72cfcf89f7a.pdf?index=trueIn PDF document text
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_78a4c9a2c3f746be82f0e332385ecd86.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gitipelut/gizekaledezixadutirabine.pdfIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_ca6ea83b99c04d57b3a131eb72f39f59.pdf?index=trueIn PDF document text
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_096f56fa743d4c34938a06e4e7ef0238.pdf?index=trueIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_8da4d212415f409aa84f7c1b20f9f84d.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 5256 bytes
SHA-256: e446277bae40a39e1d30fafd03c1d0d627a093246d9eda8da05b7c8e79e6f9a1
font_01_sfnt_off0000ff95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF95 10904 bytes
SHA-256: 2f26804a686415b9ba4fb3aff478594e8bb386a2fccca8a657d4c7c81a73a19d