Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14b942cf780bcbb…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 14:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 68f0e033a0215a67b649bf8d06dee779 SHA-1: 665ee55645cc66c6c9e4fc4d7f72452fe8602597 SHA-256: c14b942cf780bcbbb94f5c0d0ecf5b1aa144cba56f4cd1a26771e4fa7d3231ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nomylo.ru/uplcv?utm_term=after+we+fell+full+movie+online+free PDF link annotation
    • https://sitarasign.ir/data/file/bonokowo.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/32107696899.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/pawumijo.pdfIn PDF document text
    • https://wrd13.com/force/file/44538063035.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/32914542651.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/xafakabeladanak.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/28395446189.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/73053425699.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/jagevonosiresimow.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/71237204573.pdfIn PDF document text
    • http://airmon.hu/images/files/deduk.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/salagozesega.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/88362503646.pdfIn PDF document text
    • http://labsshop.com/d/files/29034507153.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/74696782213.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16325595907611.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/gudigofugotekodikirola.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/mimunine.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/19225689696.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/mukubened.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/lezalazibikojezake.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/90064946499.pdfIn 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://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_off0000ae97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE97 10276 bytes
SHA-256: a9bfbd4eeda2c88672a367f1a78b0e643084b4ef7b8c5ad5c98f7170b7e9a550
font_01_sfnt_off0000c5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ddd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD1 17152 bytes
SHA-256: ea521621f8a843d9eb68117e5a965abbd65176feb6bfaea09da0b98df1a8fced

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