Malicious PDF — malware analysis report

Static analysis result for SHA-256 02522a479cd9c944…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 06:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c4c19ef6554d159de0f335a4e361dd03 SHA-1: 260ce840505ef9562b8ecfbeb0a55e4b1e243274 SHA-256: 02522a479cd9c944831f07041e6df7f11cebb7ce6424a1f45b60b6dd0027f0dc
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a tactic to obscure malicious destinations. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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 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 http://surausa.com/uploads/files/83461240122.pdf In PDF document text
    • https://ezokniga.com/uploads/file/nitunomedirefewe.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/48374382417.pdfIn PDF document text
    • http://rococosofa.com/files/files/fijun.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/87606306416.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090213543516.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/lofemufujikejusisegana.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/35052116927.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///xuzabakaw.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/39888725217.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/tugoxukuduz.pdfIn PDF document text
    • http://usagimatur.com/files/others/gavomepusiv.pdfIn PDF document text
    • http://futboltotal.net/images/files/53277580318.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/64152622875.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/83884382156.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/tanemuganekikujisof.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134afdb0cda3---vowod.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/gimidigibude.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/15361007169.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/fiwazalebonazawarodaxi.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109030036412305.pdfIn PDF document text
    • http://asja.ua/userfiles/file/xepaxazakadivolalulijewa.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/94596938171.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/vijonoxadokinowujoxezeb.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/welaburegab.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/45343627384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=desi+serial+apkPDF 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_off0000d7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A5 18952 bytes
SHA-256: d957537bd46fa1d7da278cd8b41660263e604f7ee36b6975f3cc42a269c36d02
font_01_sfnt_off000108a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BD 10016 bytes
SHA-256: 84faa4194132727247991647cd603fbb6af4011c351097516277f0637a33d57d