Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5e1391415e3140…

MALICIOUS

PDF

75.8 KB Created: 2021-09-16 01:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e531b9ba3044e2fe784e3c734bf32269 SHA-1: 7ca8a8d72630c1a9977534e06dec501a8fdcc1c3 SHA-256: 2c5e1391415e3140ff1b353bbe05409f43641bc356d09be93ce05a8e96598734
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://abzesolar.com/uploads/files/44262019335.pdf In PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/5560379285.pdfIn PDF document text
    • http://reichspfarrer.sk/file/6830018667.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a9859d6367f2306a4b870b443b7cd221/sevotobezej.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/jefatibosisujew.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/44839652098.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/panepulaxa.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/laxorarudewi.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/wetituga.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/sageliwis.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/26541267833.pdfIn PDF document text
    • https://teamcode.net/upload/files/ronubexatofokonolozidi.pdfIn PDF document text
    • http://inphilong.com/upload/files/fiwikerozimozugojew.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • https://lotte-ppta.net/beta/assets/file/fomikilifejawifu.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109090200187120.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/29154657959.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/polatawixukuzefewajono.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/zotediwon.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/rejirotimozodipu.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/66428578396.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/jixawavoje.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/wubatakewagukozabafula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+ultimate+guide+to+ielts+speaking+by+parthesh+thakkar+pdf+free+downloadPDF 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_off0000bf78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF78 11440 bytes
SHA-256: 6638fe73e61461a4576a6267f88d51cfcd54fa48fa44de63e0fe5552599ed96e
font_01_sfnt_off0000d9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EE 17948 bytes
SHA-256: 32d7374d0b407d517044756284bb17a5d10512a22728ae9d706feb5a7da3540d
font_02_sfnt_off000108ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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