Malicious PDF — malware analysis report

Static analysis result for SHA-256 34fbf3688af6cd9c…

MALICIOUS

PDF

69.5 KB Created: 2021-09-17 11:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f7256bf435fbc7f7f5637cc84e061e8 SHA-1: 6051d0e51fa7890ed50cc1fe8e91cb04ef22d540 SHA-256: 34fbf3688af6cd9c96ec074665ba38a32f8884230fad7ebd5af73f9593047803
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 embedded URLs pointing to disposable hosting. The primary purpose appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://faresaldabbous.com/uploads/file/63976698513.pdf In PDF document text
    • http://sinostandards.net/upload/files/45526251535.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/52975893867.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/leterisoluw.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/viwobadapuxex.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/68733562667.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/biwigijebemipu.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/juluwa.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/23209587348.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/5873932457.pdfIn PDF document text
    • https://menu2uplus.com/images/file/28470148686.pdfIn PDF document text
    • http://grotech.in/userfiles/file/38645990581.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-5/20210905042828724963.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/59002879949.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/pexotibokum.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16132a5d13d396---jomakizisu.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/xowufadugemupogefova.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/53154314427.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/64132415933.pdfIn PDF document text
    • https://vientangluc.com/upload/files/panelobam.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b928f66010---guxosagufuxitozejo.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/waxalopupakugixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=loathe+in+a+sentencePDF 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_off0000aecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAECB 17208 bytes
SHA-256: e970106baeaba238a5c379988d05f68020c87f1c09d2a8ac6767320f5dcee2da
font_01_sfnt_off0000da70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF287 10140 bytes
SHA-256: 4a9f2d09b4b8127b4d7438731d0be35d4ede7079d80b31770276c4f8316fcc7e

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