Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c50fb4b025817b…

MALICIOUS

PDF

78.6 KB Created: 2021-09-13 04:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7af548c680fa57e24363e2f4b4fd71d5 SHA-1: 3c87d1b4bd8fca4196baf0ccd9ecb84c591ef78d SHA-256: 70c50fb4b025817be6c31383e33b16f508064a294837db547f393f06f577a81e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one identified as a link farm on disposable hosting, suggests an attempt to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://newworldss.com/uploads/file/kugimemujexasebus.pdf In PDF document text
    • http://allnatureint.com/userfiles/file/9485234141.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/41228090239.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/xedujulutubudiruwa.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/5431654781.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/kepuretokiguremejip.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161325eafd1416---99961524510.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-9/20210909222139285419.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/45430630381.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/dosonufu.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/96033016566.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/fobomiwobez.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/rokexaxorebidagofot.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/gezatimesitib.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/55073943328.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/34595311082.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/92180829395.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/jumijinalokopumifaw.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///wikixexibodaninaxuli.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2ed61e9f2---23562542909.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/55623230789.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210901_102801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=necrophonic+apk+full+downloadPDF 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_off0000ceb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB4 17868 bytes
SHA-256: f55184494caa1502b68d5086c379ab4a62f4264742a791819bb7f71c1b2ddccc
font_01_sfnt_off0000fcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C6 10708 bytes
SHA-256: f6d335d1ad69b783b719a925dcb4a7d17d7984be3963658d0ecd60573e0175d8

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