Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ba5ae88c68892f…

MALICIOUS

PDF

83.0 KB Created: 2021-10-14 03:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 012b5caa788d9096dffb2b799b3bc96d SHA-1: d3267ed8d43602890cbdc9e5fe2a7fce3634e170 SHA-256: e0ba5ae88c68892f5939182b91e8bbb4214cd29493d3a41c7152c5c6cfe10d80
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm. While no scripts were extracted, the presence of numerous external URLs suggests a phishing or redirection attempt. The file's structure and heuristic firings point towards a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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 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://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/0fhcq2vavi634jq1st9dc4f6li/patidofelolavomizutakoguk.pdf In PDF document text
    • http://hasyo.net/files/file/68048936978.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/75096914021.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/60681465699.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/55297743636.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/80470192870.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/xuxedowa.pdfIn PDF document text
    • http://anm-av.de/uploads/files/kexujaloputas.pdfIn PDF document text
    • https://fasaac.org/temp/files/bezamukobowusujifaw.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/4248919307.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/bumifozud.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/zuxegamozipol.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/25826867963.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/75894042281.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/36802637250.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/26135147889.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/24971390793.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/5524294120.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/kuxepafidexovezo.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/45922971714.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/vizedizogeluk.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/kuviwuterive.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/golirezevuzexodem.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1632742159rKSn.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/EqozwcbAC44/uplcv?utm_term=african+peacock+cichlidsPDF link annotation
    • 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://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_off0000dbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 19800 bytes
SHA-256: a2e903dd329330ab3fe1370ccdae5d35a8ed23b4cea0142699d04bd57d45be01
font_02_sfnt_off0001264e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264E 10692 bytes
SHA-256: 1cc9352e2b29598bdc86bbe86cfd3bfecaa2c48e2925dd80ab03d00282892c6e