Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab00b8aed3b1ff81…

MALICIOUS

PDF

79.0 KB Created: 2021-06-01 07:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: eefc24b92dd8034937f8403f8faebf03 SHA-1: efe6efd31647a2e610903fd5076729acde416407 SHA-256: ab00b8aed3b1ff818341bb7640d2672a7bc61334f3064e1e0804bdb190fc9aed
186 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains a large number of external links, many hosted on disposable domains like weebly.com, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ketchas.ru/pbw?utm_term=ejercicios+resueltos+de+energia+mecanica PDF link annotation
    • https://difodofixipa.weebly.com/uploads/1/3/0/8/130814112/rodanu-nezetabudu-bivotor-nutani.pdfIn PDF document text
    • https://zovafizi.weebly.com/uploads/1/3/0/8/130874114/6517943.pdfIn PDF document text
    • https://rowidonisobixi.weebly.com/uploads/1/3/4/3/134374630/kazipejemunefun.pdfIn PDF document text
    • https://sekilulijafos.weebly.com/uploads/1/3/1/4/131438177/damozebugedoreza.pdfIn PDF document text
    • https://zuxidonav.weebly.com/uploads/1/3/4/8/134867872/fidolukadunokiw_daxavew.pdfIn PDF document text
    • https://katalajoguv.weebly.com/uploads/1/3/2/7/132740778/3122213.pdfIn PDF document text
    • https://guvoruba.weebly.com/uploads/1/3/4/7/134742814/0ddb7fb8594ac4.pdfIn PDF document text
    • https://levunabul.weebly.com/uploads/1/3/1/4/131407164/jamoxuj_mivixiludar_pefapoba_xozisuf.pdfIn PDF document text
    • https://lomedalepa.weebly.com/uploads/1/3/4/4/134438906/velavexitafin-givavotokabus.pdfIn PDF document text
    • https://pobanuritixejun.weebly.com/uploads/1/3/4/6/134601578/putugitapix.pdfIn PDF document text
    • https://modovepa.weebly.com/uploads/1/3/4/4/134464072/lupum.pdfIn PDF document text
    • https://salizobujexi.weebly.com/uploads/1/3/5/3/135325558/f7567ae85d4de14.pdfIn PDF document text
    • https://rinixupikexem.weebly.com/uploads/1/3/4/0/134096042/xijuveronulix-bitib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wozixokumo.pbworks.com/f/why_is_my_printer_not_printing_black_properly.pdfIn PDF document text
    • http://sewafebi.pbworks.com/f/whatever_a_man_thinketh_so_is_he_niv.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/f/bartending_tips_and_tricks_for_beginners.pdfIn PDF document text
    • http://bovozajezo.pbworks.com/f/etina_express_1_download.pdfIn PDF document text
    • http://bovojigu.pbworks.com/f/hemophilia_the_royal_disease_answer_key.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144411396/gexibewuzudofijuxob.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B6 5292 bytes
SHA-256: df3001908cf6ae61219a3ed760c0be297a330d47093056491d97bec88367d16d
font_01_sfnt_off0000f3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 11196 bytes
SHA-256: a74e8397be4ac39402c47814dc52407c8696c4743c0fd3383ab2bf6467703f97
font_02_sfnt_off00011845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11845 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb