Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b507800307cabd…

MALICIOUS

PDF

73.7 KB Created: 2021-09-11 05:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e03f4db4ed93c71b7c8b252e45b02e7b SHA-1: 9873d59af11296c68355d6bca9bd6eddf564e058 SHA-256: 31b507800307cabd155cf74388d5c805ccaf84b8c55607f59bf6778f6b06df6c
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs, many hosted on disposable domains. While no scripts were directly extracted, the presence of external links and the overall classification suggest an intent to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://jnvhardoi.org/ckfinder/userfiles/files/bativurebagazozite.pdf In PDF document text
    • https://autosaloncenter.com/uploads/file/22578861235.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/3852005389.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/96011305.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/81008870498.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/mevewisuf.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/84305918407.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/vujabepazumeloda.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/lalifexujo.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/bujezoziniromujefeja.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/10559448186.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210906171501.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/99760125358.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/vinegovozugilov.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/91747465122.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/96435527252.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/14153619334.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/tomedizineb.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/86142331651.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/bubure.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/b566d20fd8e305a3a68504862efda4d3/tekemaxarusovizopogi.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/kexofepitiji.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/41519983467.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/52382854599.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210901155516344802.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/febomev.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/67831177079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=sticker+maker+premium+apk+viko+%26+coPDF 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_off0000bc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC02 10548 bytes
SHA-256: f040e12d12cf07e937ab79dc1cb31b84549920b371ef53be0c7f2a139f9fa1eb
font_01_sfnt_off0000d424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD424 17124 bytes
SHA-256: c43c306e0939a669cd325a67ffd467f51b889ed1c1df5e088bdfb5517c44bcc4
font_02_sfnt_off0001011b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1