Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef4f3706b53d4eb…

MALICIOUS

PDF

82.5 KB Created: 2021-09-11 02:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ffc0aeccc91be8c3478d1f10096c1a09 SHA-1: 062b3c591a5a9c9214593c26a6e4934a3a0d5452 SHA-256: 9ef4f3706b53d4eb3616f30e1c161ed60936fa89d1b044c44e6e707dd3038293
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by a ML classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to PDF files on various domains, suggests a link farm designed to manipulate search engine results or distribute further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically calls out this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://giasuminhtam.com/Images_upload/files/1158024815.pdf In PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/jisinewagiraninos.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/88913271391.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/xizari.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/14052835284.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/punubagosibivasaxas.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/77606087256.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/45939592712.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/a7g2gj2mu16ra3cp97e4v3jp81/tezoronotukidiwatase.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/67356013994.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/wufagewozufebamez.pdfIn PDF document text
    • http://brenderup.ro/mm/file/semezolefikunamojoxutelof.pdfIn PDF document text
    • https://shevian.com/images/file/metorosawesijila.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/80147090466.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/kikam.pdfIn PDF document text
    • http://pensiunea-escape.ro/ckfinder/userfiles/files/bopesinusugigafanedor.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/zujasovotevi.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/53603274387.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/51741128811.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/7b9d0a188e5cc3167dc87a5f1300b45f/81271203307.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/9976821839.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/losaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=presets+for+lightroom+mobile+koloro+mod+apk+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_off0000dbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFF 17892 bytes
SHA-256: 71739e25f69910847489fce2b789d6fe2ff6c46d3d8a9220883fbc414b5ede38
font_01_sfnt_off00010a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A11 11264 bytes
SHA-256: 8b5fed5d2c8605a92cdadc78c5b993b02ab2d8e49b1e042b33fe82ac0c92f100
font_02_sfnt_off000123f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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