Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d571aec6e96061…

MALICIOUS

PDF

76.2 KB Created: 2021-03-17 10:21:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1d8ee8a452e74e8738c635cb78f74789 SHA-1: d5e06a803884c9d1e6403264a3b2a80e3856420b SHA-256: 28d571aec6e9606130f44dd62d62755ba4e1e86d313ef2d1abda8a664db4e2fb
226 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, which is characteristic of SEO link farms used to distribute malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to decrypt a payload, suggesting a multi-stage attack. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://midufefew.ru/strik?utm_term=configurar+telefono+grandstream+gxp1405 PDF link annotation
    • https://cdn.sqhk.co/livatunozasu/ghggFja/tilting_point_star_trek_timelines_forums.pdfIn PDF document text
    • https://cdn.sqhk.co/wagejino/jijgggX/kofuz.pdfIn PDF document text
    • https://gidepojijozi.weebly.com/uploads/1/3/4/2/134235950/guwevizebiniwexu.pdfIn PDF document text
    • https://cdn.sqhk.co/bipuzojafa/V4kpnjd/drag_racing_helmets_ebay.pdfIn PDF document text
    • https://cdn.sqhk.co/pagifizipafo/hcghlhd/lafepenonupemim.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/cbgj7gg/rawem.pdfIn PDF document text
    • http://talerexogite.iblogger.org/zowojumefurujida.pdfIn PDF document text
    • https://kaledawuvilef.weebly.com/uploads/1/3/4/7/134727412/ce30b74808030.pdfIn PDF document text
    • https://larezonisu.weebly.com/uploads/1/3/0/7/130738889/wizebedibej_zivewediwuki_jumuk_joliwesuriror.pdfIn PDF document text
    • https://cdn.sqhk.co/xorunase/hgHjjE3/21214327881.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/qMYhbZv/tudupuzexofepomuziro.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/2bfyNig/star_wars_timeline_order_to_watch.pdfIn PDF document text
    • https://cdn.sqhk.co/kufagilan/jdWghAR/299934480.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/Ankljbh/96266373108.pdfIn PDF document text
    • https://mojikusabuja.weebly.com/uploads/1/3/5/3/135301399/fapunetakawe_venutof_xipame.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://misamoxatupepos.rf.gd/25010633960.pdfIn PDF document text
    • http://denotepisijolib.rf.gd/is_there_any_nutritional_value_in_romaine_lettuce.pdfIn PDF document text
    • http://fexajorijoworas.epizy.com/autotune_5_dll_free.pdfIn PDF document text
    • http://xejolufu.epizy.com/xebudolonurujisoxidorota.pdfIn PDF document text
    • http://xepalufozakot.epizy.com/50624544866.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_off0000e533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE533 5740 bytes
SHA-256: 94d13c7e616380c3064076081eb855de75a053b8e22387fe005d0bb934fe3d0c
font_01_sfnt_off0000f8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BF 12444 bytes
SHA-256: 8091752ac3516f5f293dfc621187ecbf4d73b6e2c5c94ac70ed6b40af377a474

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