Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2c2dbcdb9423bc…

MALICIOUS

PDF

78.4 KB Created: 2021-03-05 01:47:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 22d7992187304d8aaa4fc273da23d66c SHA-1: 261aaea834c1fc5d3df1053ba77a4439dd3f8d7d SHA-256: ca2c2dbcdb9423bcc55b9e8a621aab389521c10fda9b7427ced99c2d0720de4e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed for SEO. It contains numerous external URIs, including a primary one pointing to 'https://nipisod.ru/strik?utm_term=dodge+ram+1500+accessories+canada', suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often abused for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=dodge+ram+1500+accessories+canada PDF link annotation
    • https://cdn.sqhk.co/kisasizaro/shgziix/music_video_maker_software_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/Ohafi2G/48281578278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_60164acccaf07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460981/normal_60129896b56e2.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/41511632551.pdfIn PDF document text
    • https://cdn.sqhk.co/judixixelof/j5LTjjF/nikini.pdfIn PDF document text
    • https://cdn.sqhk.co/fogunedevare/hiCjbhb/xepuzebi.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/2Ljj5ji/luxuf.pdfIn PDF document text
    • https://pizipeko.weebly.com/uploads/1/3/4/6/134611096/xivepimopa.pdfIn PDF document text
    • https://cdn.sqhk.co/zopisipiwele/aWjehbY/jisupobesobe.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/if_i_ran_the_zoo_book_app.pdfIn PDF document text
    • http://vomimaforotagi.mywebcommunity.org/mekijimojegokotevugapek.pdfIn PDF document text
    • https://cdn.sqhk.co/dopuzodopuvu/icdgdOv/66992979172.pdfIn PDF document text
    • https://cdn.sqhk.co/sulubejes/hchaMih/tech_go_launcher_ex_theme_butterfly.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464524/normal_5fcb1d2d90744.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409257/normal_5fd315622f0ad.pdfIn PDF document text
    • https://gilurumujeluzem.weebly.com/uploads/1/3/1/8/131857598/2768360.pdfIn PDF document text
    • https://masudokunu.weebly.com/uploads/1/3/4/7/134731157/basilisa.pdfIn PDF document text
    • https://cdn.sqhk.co/vufebevefo/TDigYig/rene_caballero_age.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/satulibaren/mixigarexukevebugime.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/91775329467.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/tugepaxudufiwibo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE687 5252 bytes
SHA-256: 4cd84b1f43d7af979b98cfb0280f9b779b68e15813599ab0dd1fce1c0d586590
font_01_sfnt_off0000f848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF848 11028 bytes
SHA-256: 6eca21b3b527a542d5c6836f4758bef0f750804b16edb21067dbfe0994b7623a
font_02_sfnt_off00011e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e