Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18932c887986a68…

MALICIOUS

PDF

79.3 KB Created: 2021-02-22 03:03:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ecb6d135bd0b6f2aa8be7977e70e80e5 SHA-1: b0e4b713a9e73169fa4cd8a44612427669de71e0 SHA-256: f18932c887986a688a8582c035b6b31f68f8e25328a769dda385482cb74fb6e3
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 hosted on disposable domains, indicative of a link farm or SEO spam. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

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://jacksth.ru/wix?keyword=vfw+halls+for+rent+st+louis+mo PDF link annotation
    • https://gekowodi.weebly.com/uploads/1/3/5/3/135321574/ninujim-dixulabenowep-katomot.pdfIn PDF document text
    • https://verigidiloje.weebly.com/uploads/1/3/0/8/130874422/mozugowisoje.pdfIn PDF document text
    • https://suxugugufagiwa.weebly.com/uploads/1/3/4/7/134740592/siligajural.pdfIn PDF document text
    • https://wuguruxozoza.weebly.com/uploads/1/3/4/0/134040539/501225cb81.pdfIn PDF document text
    • https://rumikupim.weebly.com/uploads/1/3/5/3/135310872/jukufiluvorogakagega.pdfIn PDF document text
    • http://heleogose.online/14067034855en5pt.pdfIn PDF document text
    • http://mini-cam1.club/celsius_to_fahrenheit_conversion_tablekt2mr.pdfIn PDF document text
    • http://7lessons.site/vijeo_webgate_activex_control_windows_10mv9tq.pdfIn PDF document text
    • https://romiwewigases.weebly.com/uploads/1/3/2/6/132682929/1888728.pdfIn PDF document text
    • https://jekosupoma.weebly.com/uploads/1/3/1/6/131637113/bb72d4.pdfIn PDF document text
    • http://kanshoper.site/3d_analyzer_software_for_pc_freevklrt.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/gazijewevan/laninazazejofufelenu.pdfIn PDF document text
    • http://tuxugev.epizy.com/budget_2018_malaysia_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/kusilaxekunalumevafemud.pdfIn PDF document text
    • http://xawabaxazulaga.epizy.com/ferrari_carano_siena_tech_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/formal_mail_format_for_job_application.pdfIn PDF document text
    • http://fufabufitilaf.epizy.com/ann_marie_unlove_you.pdfIn PDF document text
    • http://xinovedef.rf.gd/cdate_in_vb._net_to_format_date.pdfIn PDF document text
    • http://xebinuv.rf.gd/how_to_attach_laminate_sheet_to_countertop.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/gerividatuponidedad.pdfIn PDF document text
    • http://falivodekolulo.epizy.com/zoweneb.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_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 4944 bytes
SHA-256: b521e70085b7c28620bf4cc5f0185f92c0a8d426c9520a0035f955c4dd4e598c
font_01_sfnt_off0000fe26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE26 10276 bytes
SHA-256: e10d0936971b5b6a38f84fe2a057c84f6303cc4d60f720ee08afb73286919068
font_02_sfnt_off00012156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12156 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361