Malicious PDF — malware analysis report

Static analysis result for SHA-256 271e47ac4de99862…

MALICIOUS

PDF

77.8 KB Created: 2021-09-13 07:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3ceee62f4dc1110371e826203a15ed87 SHA-1: 6a6d40ac415ca7ec9d78c3a02b62bc267b0cf8f2 SHA-256: 271e47ac4de9986256d2403a102f9e341e3523bc3e9d66a39148491c6e2f8b59
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a structure designed to host many links on disposable domains, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of external URIs and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://huntic.ru/uplcv?utm_term=android+studio+build+react+native+app PDF link annotation
    • http://tmkb.org.tr/ckfinder/userfiles/files/lekigafuzu.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/12054445101.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/12366917637.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/zurojomomugomujiruvik.pdfIn PDF document text
    • http://nextgenship.net/upload/file/2021090116305266530.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/59676908227.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/60462539527.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/gozulivezunenejides.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130abc45e5f8---xanijideneju.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/71007176066.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/jerululagisamalubakisaja.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/pakovikazura.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/34258369421.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/gepamawusobof.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/33219795594.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/19720772497.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/fiviwe.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/putonalanig.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/suvavudimakigo.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/sedoragadigazew.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/gosonufuladuxix.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///79686970059.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/60705720947.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/titewalem.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091302274815.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/85473226904.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_off0000ca14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA14 10796 bytes
SHA-256: fbb9ebecbb4e6d23643921bc202c5fe46fd7ae73d74b0b59265b39b975d62937
font_01_sfnt_off0000e2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 17792 bytes
SHA-256: 2ed2315999736adaf0347e4c5cacda96db72de36a412b5d27934d66ac9449246