Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3aa253102a59b5e…

MALICIOUS

PDF

88.0 KB Created: 2021-05-09 05:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 11106dff47cf4b5157e6122ec69b401a SHA-1: c4bac64721ddc7eb08dcb68e938803b53d6742d5 SHA-256: a3aa253102a59b5e6a122b628ca23f84f8df3c5f97822ee0dff9061c96e8ba66
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vilenefex.ru/strik?utm_term=is+anyone+afraid+of+losing+me+quotes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4423427/normal_5fcaa5b2c049e.pdfIn PDF document text
    • https://zawibovime.weebly.com/uploads/1/3/2/6/132681883/4885527.pdfIn PDF document text
    • https://filekudop.weebly.com/uploads/1/3/4/0/134017403/bawuvunalele-nanelavusivo-jupexe.pdfIn PDF document text
    • https://pulamawuba.weebly.com/uploads/1/3/0/8/130873907/negugajalupo_jijimanigak_xudemi_jijinak.pdfIn PDF document text
    • https://lepovomika.weebly.com/uploads/1/3/4/7/134701686/worarexamabubinevam.pdfIn PDF document text
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/5901dd9.pdfIn PDF document text
    • https://gesunujas.weebly.com/uploads/1/3/4/5/134509411/barufejafopitatezu.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/fjaidjg/nerifufebabaru.pdfIn PDF document text
    • https://cdn.sqhk.co/kebabefepu/ihkcGKL/streamlabs_vs_obs_live.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382790/normal_5fc8303778661.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483839/normal_604a7a39cfcde.pdfIn PDF document text
    • https://molawaxurot.weebly.com/uploads/1/3/4/6/134699933/7845588.pdfIn PDF document text
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/kazinukud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e263c692-db18-4b86-95f8-417107586c96/what_temperature_does_a_food_dehydrator_work_at.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/tamil_love_album_songs_wapwon.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/30577956998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af7b54d6-67f1-4726-8534-f6eb98fb67cf/hp_officejet_pro_x576dw_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79434beb-4d95-42ca-9609-87d8e4e78b02/para_que_sirve_el_te_de_manzanilla_con_limon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47db1067-eeb1-4871-8f01-d46489e3857c/80586131745.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/48540457572.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/pabuweg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07a787bb-f2f2-4f89-b4d0-169196cb431c/96952765659.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_off0000ff35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF35 5392 bytes
SHA-256: 38c682a5d38e1b44df39698abdbc40e362a0f70f0f56085b7f781a079296da11
font_01_sfnt_off00011177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11177 11640 bytes
SHA-256: eab064d061a4f5de5c229534bcd87067c8c29402888538fb99e7cdebf553eb9f
font_02_sfnt_off00013923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13923 17232 bytes
SHA-256: 84d44a49913c86175ca12011cfbbb36419930112cc85dd5539bc170b31f2bcb2

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