Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1916dc4437afc73…

MALICIOUS

PDF

99.0 KB Created: 2021-09-20 00:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 54dbc26a66e2561dc2bdbb72343a9bad SHA-1: 8e7010c0d0282427b17fa5f438f8ec6ab21a7ec8 SHA-256: b1916dc4437afc73277ea1aeb8627aabfeb17562953570aa2288c3806c1ea393
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to unknown or potentially malicious domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging exploits or social engineering to achieve its goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://anpheatingandac.com/nbloom/fckuploads/file/33541673191.pdf In PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/8489297783.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161328e426e5fc---8089059414.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/44706292355.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/64543524694.pdfIn PDF document text
    • http://lse.hu/userfiles/file/zekabixi.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/jelozowafug.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/porupanipetizogofesoviwu.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/xasawakefuzofenob.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/kesije.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/11859370359.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/38124229689.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/57602591172.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/78817288044.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/44502801921.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/45816814499.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/tezerukefosapuroniku.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/10775185618.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/14911544373.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/disujagixegobuxis.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f565d771de---52839956967.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210917/file/16319022146767.pdfIn PDF document text
    • http://juncheng.tw/upload/files/bezuvowabugolijuxoni.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/20287867576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=real+steel+boxing+champions+unlimited+moneyPDF 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_off00011d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D31 11360 bytes
SHA-256: d08c6fd56e5046f9d19618c515104b7be80d09bfe6f5cbbfa7543f1337c5603d
font_01_sfnt_off00013763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F75 17784 bytes
SHA-256: 7d48bc2b7d4f4591326e52ef8bfedad13f98647aac237b073f959e9b79e5527b