Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a3826bf9463419…

MALICIOUS

PDF

68.8 KB Created: 2021-09-27 20:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15fdb41edbf367309e359d31f0e1fe68 SHA-1: 43c4cf0e13aa0f77e2dbd501099feb5c211b2a75 SHA-256: 90a3826bf9463419271cdedbd74d2c899f6039577f636230a457dbf662f899f2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only document designed as a lure, typical for phishing attacks. It contains numerous external links, many pointing to disposable domains, suggesting an attempt to distribute malicious content or redirect users to phishing sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://ibconsulting.it/userfiles/files/sovosemogesidukevufu.pdf In PDF document text
    • http://healthywithhart.com/res/file/gufefafijawunewexaro.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/jelixeraxuzotamividox.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/42784320866.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/xafamasa.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/40761729168.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/sokorotanuvi.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/9140079892.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210917181717279.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109221152538570.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/jevigovizowudoxawu.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/62219952720.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210912032004_1572404128.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/55286337779.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/sajatomulutifuzebi.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/45721178970.pdfIn PDF document text
    • https://karjerastests.bankai.lv/ckfinder/userfiles/files/dafifoxudopegow.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/17061446913.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/54015459497.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/64452606051.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139175f866ac---lopevoxufetovodotisuzitaw.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614553bd45d15---50729507300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=simcity+buildit+play+storePDF 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_off0000afa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA8 14076 bytes
SHA-256: 961e9d9c5ca38a63e1952cea4037ea3ad11b909eb8c16d6e4b4cb0eca601c0a6
font_01_sfnt_off0000d2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABF 11000 bytes
SHA-256: 556d5a6a0bbb72834216befb0f6c51612970bc24bfe335700f62e0c7dc045a2c