Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19dcd3b6eac0e11…

MALICIOUS

PDF

76.6 KB Created: 2021-05-02 13:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a196ed4ba17738240c295eba7ef23b18 SHA-1: 2670c4d591b120f75cd95f54a6aff2f65e5018f8 SHA-256: a19dcd3b6eac0e11ec21ca1d87a1ae4407b9040b52c06b76bb724ef1f048beda
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The primary URL, 'https://maypoin.ru/strik?utm_term=what+is+the+history+of+israel+and+jerusalem', is presented as a search result, further supporting this. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=what+is+the+history+of+israel+and+jerusalem PDF link annotation
    • https://vepibasizux.weebly.com/uploads/1/3/1/3/131380915/loditikifijekib.pdfIn PDF document text
    • https://cdn.sqhk.co/vomemubevu/hKVcKjb/home_again_movie_300mb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417312/normal_602b3f14613d6.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/XIEhqD7/building_tap_room.pdfIn PDF document text
    • https://kegegofelev.weebly.com/uploads/1/3/2/6/132681159/dulofewarimuvexuvus.pdfIn PDF document text
    • https://cdn.sqhk.co/rupomotiz/ghjdejj/huey_p_newton_gun_club.pdfIn PDF document text
    • https://cdn.sqhk.co/dukapudubi/gisiahe/us_world_cup_soccer_championships.pdfIn PDF document text
    • https://nabofirolem.weebly.com/uploads/1/3/4/6/134632364/8834155.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495385/normal_5ffd4ea498ca1.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/jjfhdjg/blue_mountain_village_map.pdfIn PDF document text
    • https://cdn.sqhk.co/gukitane/iiihdiO/goteburokabobevanalijibu.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/GVhbs0R/sumesug.pdfIn PDF document text
    • https://fepobiwebefu.weebly.com/uploads/1/3/4/5/134592484/0d14d311ce.pdfIn PDF document text
    • https://rejejowurodesom.weebly.com/uploads/1/3/1/3/131398559/4510802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446015/normal_604d0b74551e2.pdfIn PDF document text
    • https://cdn.sqhk.co/giwumazusew/hes9whe/bubble_tea_flavors_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446038/normal_60344ef8bd03f.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/bupesejirijejus/cv_format_free_word_document.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/captain_america_4k_hd_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/68471691989.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/38048870157.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_off0000ee6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 5340 bytes
SHA-256: 9e30ef251ead4f68ffebd7e5fc00ae53b70798034d77fc948899158ffdaf0c1b
font_01_sfnt_off00010082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10082 10688 bytes
SHA-256: 18f4556493910a7d8cf5c169d75419745855a22d5c58c23e3afbea4eefad17d3