Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf5c268b3dec84a…

MALICIOUS

PDF

72.9 KB Created: 2021-02-28 08:27:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 663869c497325e4638b82c8c813b3653 SHA-1: 911d9c280a40dd2b04b3c7da923238ef74cd55fe SHA-256: 1bf5c268b3dec84af6c9f1fcbdaec2254e31aed2317e3742290b1adf1f091d75
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable or used for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and numerous external links suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/aws?utm_term=world+map+outline+with+country+names+printable PDF link annotation
    • http://1freedom.space/math_123_sjsu23sq9.pdfIn PDF document text
    • https://cdn.sqhk.co/milimewaj/kXgfha3/pirazudegefomuzirege.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/IKwiagi/nigubifelavorufexanapako.pdfIn PDF document text
    • https://xapewagese.weebly.com/uploads/1/3/4/3/134314981/2a275c1c8712aa.pdfIn PDF document text
    • http://reduslim-shopufficiale.site/caracteristicas_de_las_neoplasias_benignas_y_malignask0tlf.pdfIn PDF document text
    • http://dressnbuy.com/acapulco_shore_6_capitulo_4fyn53.pdfIn PDF document text
    • https://menanotiji.weebly.com/uploads/1/3/4/3/134322389/wiwum.pdfIn PDF document text
    • http://copriyghtconfirmed.com/nezesozabeohif2.pdfIn PDF document text
    • https://vawanateriti.weebly.com/uploads/1/3/0/9/130969814/mitukabokiw.pdfIn PDF document text
    • https://rijojuno.weebly.com/uploads/1/3/5/3/135310883/nubiva-vovagevaxe-vafibeleseri-tujemujimire.pdfIn PDF document text
    • https://gemexufata.weebly.com/uploads/1/3/0/7/130739895/8956e1622d508d.pdfIn PDF document text
    • http://opensoda.pro/303566196465ctxi.pdfIn PDF document text
    • https://kolokizegilo.weebly.com/uploads/1/3/4/3/134370221/a9c6031.pdfIn PDF document text
    • https://cdn.sqhk.co/xadeviro/EjhjbWO/red_ball_4_game_full_video.pdfIn PDF document text
    • https://cdn.sqhk.co/baxotonad/59jajbF/fabububejariliwa.pdfIn PDF document text
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/sifegifafilesoj-vozanerumafab.pdfIn PDF document text
    • http://jovopomutulilo.medianewsonline.com/45910830556.pdfIn PDF document text
    • http://jusapp.club/how_to_use_oster_6_cup_rice_cooker01bnv.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/haWidXb/58127445223.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000de70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE70 5660 bytes
SHA-256: 3a73f33df92b27ae647439ea52b6b9c1384da81708022e6cef8a173b9f07a5e4
font_01_sfnt_off0000f191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 10752 bytes
SHA-256: 7a7045fd6cdb9f5780b8815c67c30309be1a2f9da119c57391ca6eca88d43fdd

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