Malicious PDF — malware analysis report

Static analysis result for SHA-256 383f29f88565ae26…

MALICIOUS

PDF

77.9 KB Created: 2021-03-31 16:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d6bde1a422ca186192170828aa7fd803 SHA-1: b81b3bb1c275104774446926b2f9f7b66c2ca331 SHA-256: 383f29f88565ae26fe124d5364956a85ae041352822166515ff2fd4d40c77008
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, identified as a link farm. The heuristic 'PDF_SEO_LINK_FARM' indicates a significant number of links, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via the linked URLs.

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://leonvi.ru/123?utm_term=fillable+word+calendar+template PDF link annotation
    • https://cdn.sqhk.co/tezizejaropu/NjfijlG/beekeeping_journal.pdfIn PDF document text
    • https://cdn.sqhk.co/vofepubot/bjzhfjd/tegexedelufupukapi.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/jgii7zB/rgb_color_match_runner.pdfIn PDF document text
    • http://xijonofupawulo.mypressonline.com/80781027734.pdfIn PDF document text
    • https://cdn.sqhk.co/lewivapawo/ihWhhhc/williams_pinball_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/bzCvigC/dentist_assistant_job_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/h6wRJSZ/fitolemolupedosenimemek.pdfIn PDF document text
    • https://cdn.sqhk.co/pesasotiro/07jbZhb/91527277270.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/2ZrvSgl/19965671752.pdfIn PDF document text
    • https://cdn.sqhk.co/gafazakedoki/djggiRl/fuvolelu.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvesanap/ggejchc/37389088809.pdfIn PDF document text
    • https://ramimuluvisefo.weebly.com/uploads/1/3/0/7/130775145/1500555.pdfIn PDF document text
    • http://tobafiga.medianewsonline.com/8488403704.pdfIn PDF document text
    • https://lujisitezolip.weebly.com/uploads/1/3/4/1/134109273/gijixizibukizegejonu.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/UQjhPlU/traffic_rider_3d_lite_mod_apk.pdfIn PDF document text
    • https://xelewutoritawi.weebly.com/uploads/1/3/1/0/131070131/zepafumamavebitu.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://uploads.strikinglycdn.com/files/94c9b558-87d4-4d05-a6bc-329c46466324/21662573277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8813c45-a56e-40b9-9811-14d41c70cba8/cisco_rv320_factory_reset.pdfIn PDF document text
    • http://pikaderobiw.atwebpages.com/81847780694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98ffd514-8d77-4eff-9107-58cfe0f88534/81682516642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d89bb601-9ec1-4f3b-b99f-b699576f4000/how_to_unlock_the_bolt_action_rifle_rdr2.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_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 5016 bytes
SHA-256: 51209f0b866e7f884d54753a580bac9944fa1d91f940706ea0f72caa91cad7fb
font_01_sfnt_off0000f907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 10180 bytes
SHA-256: a52220388350f81dab891f02550e5e97e67dbed0fed5a20eba81e976e09bdcc8
font_02_sfnt_off00011bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDB 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333