Malicious PDF — malware analysis report

Static analysis result for SHA-256 09cb4a5da90046a6…

MALICIOUS

PDF

82.5 KB Created: 2021-09-15 13:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a048753cbf897c87d88dcb48babe8b08 SHA-1: eb04f43fd46be8e2a195b62ef9b94ed60e18a764 SHA-256: 09cb4a5da90046a6f62a529739fe181bbedfe8d00487ca8d6ff38d5698c37490
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF 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 pointing to disposable hosting, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and heuristic firings strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://myphammonly.com/luutru/files/68682182041.pdf In PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/29696342523.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/xaborikokuxuxugivazuji.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/7226240920.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/pevaxixaxi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f06bbec259---67391221863.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/51012717644.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161419f5bea5a4---43155337842.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/21683412343.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/mikidegiladupadefujim.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/84727988860.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/mifidufuvusi.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/gonimagakuzajopanifusux.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/gekodunewosoximojafe.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/92818789736.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/gazisetapaxetobe.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/041402455531.pdfIn PDF document text
    • http://vhz.cz/user-files/63635630321.pdfIn PDF document text
    • http://cascad-trans.ru/files/rodidub.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/sumafupijefukezigeruf.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/xolikenazoxadaribasetitu.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/fuleloro.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/47636236233.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/fovexelitoremojepix.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/75721546901.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/sodogaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=streaming+complete+vfPDF 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_off0000d9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D4 18992 bytes
SHA-256: 75b0b8c0e6c66cd871675fde2dd45eb93cfe087be33518dbeb1330f8faca69f2
font_01_sfnt_off00010b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B88 10796 bytes
SHA-256: 52532b0d1b1bb0e7ffdea5d95afeb80fc2cb81d492e27d25e2e6ee200b072584
font_02_sfnt_off00012471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1