Malicious PDF — malware analysis report

Static analysis result for SHA-256 272ed62365a87c36…

MALICIOUS

PDF

73.6 KB Created: 2021-09-29 13:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01196ea480158f0dc7843c5e89fc58da SHA-1: ad7658fdc62c2031fd7954836058096b6ff3f00b SHA-256: 272ed62365a87c366528566fec830402c60b4d4198cb9c287165cf0388932cf8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged as a link farm. ClamAV and ML classifiers identify it as malicious, specifically a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://mtcongnghiepxanh.com/upload/fckimagesfile/47864539067.pdf In PDF document text
    • http://stonepigments.com/userfiles/file/jajorewekuxabepodo.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/xumaximixorejavumod.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/vimutijalokiwedetefem.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/nozimiraxonugar.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/tofojumuwawutidunogom.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/17507701830.pdfIn PDF document text
    • http://webbolt.fono.hu/data/editorfile/63114199534.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/63309984672.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/majekunezuv.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/noridufumuwirus.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/veragesijonepurifop.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16141d6dd2cdc6---95166560456.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/daxonetufofefakaren.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/99699125411.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/71799709920.pdfIn PDF document text
    • https://atavio.ru/files/file/88123867284.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/zigizusajotinojetofuwi.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/bigolulalesemofoku.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/bawalikapelupiwoxurim.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///mabuminuwidojafapelus.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///68928783227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=freeflix+hq+pro+apk+firestickPDF 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_off0000b57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD96 10792 bytes
SHA-256: b54b9d0481b9da4f35525c60c14b61361d98d821b6ef479c216ce43ce2db147d
font_02_sfnt_off0000e68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68D 19132 bytes
SHA-256: 34d828032d1103c6197c0ab53669d7a5caab3276663c669262dcff9314c68022