Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09f5e3558bfcba0…

MALICIOUS

PDF

84.3 KB Created: 2021-09-18 19:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4ae7bb5d78f99726f3c4384990711a5b SHA-1: cbaa52fa9c73c6356df80d5974e1f1e95a193a54 SHA-256: d09f5e3558bfcba00adc31d530dbb4b7843908eb6e6a809a903df6c580f8feef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are flagged as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=how+to+repair+display+of+android+mobile PDF link annotation
    • http://easy-sleep24.de/shop/images/editorfiles/file/43334217030.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/17255620138.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/69569134689.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/80120937068.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/92236073606.pdfIn PDF document text
    • http://hrudolf.com/userfiles/juwedolux.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/7115329389.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631858385.pdfIn PDF document text
    • http://df-2.de/images/daten/file/jekisomebijolub.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/rexige.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/puwuxokenebapej.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/82003917430.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-18/20210918035111624042.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7f6b81f88---gamiluxegametosulil.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/74593628125.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210918_040440.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/4763146667.pdfIn PDF document text
    • https://jung-yeunjang.ch/userfiles/file/basapa.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/mazevuvafu.pdfIn PDF document text
    • https://eetravel.net/file/1650777390.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/6417214101.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/lafijoran.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/wavinogego.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/16889047877.pdfIn PDF document text
    • 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_off0000e203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE203 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1A 10988 bytes
SHA-256: 772981af1117793fc9259567864a8316a8528836a4e0a76c393a1fc7976b8900
font_02_sfnt_off00011361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11361 18548 bytes
SHA-256: d8f9a9b16059e60e7b1f0c298207c138f0b1c2e9f005983bc35e70a4b6e5be60