Malicious PDF — malware analysis report

Static analysis result for SHA-256 671fb58e5db06ff8…

MALICIOUS

PDF

79.4 KB Created: 2021-09-11 00:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b00c4f3ae1a1172b462008ba02e99622 SHA-1: 0a2f3a0a520e9c78a5f02a03bcf36b90a998de6d SHA-256: 671fb58e5db06ff8917f0d7c43a002d0c4344c81e98a3b3f728bc124376a13d8
186 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm and a lure for clipboard command execution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document likely instructs the user to copy and paste content into a shell, which is a common technique to download and execute a secondary payload from one of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://jgbt.us/pds/userfiles/files/fewepakaledado.pdf In PDF document text
    • http://birzebbugastpetersfc.com/files/file/72229111486.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac4676c1bf---lofize.pdfIn PDF document text
    • https://termoformat.md/img/files/bakiri.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/49003910935.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/murasupawatanikakopi.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/gukiwijuxomuxapiw.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/36839117862.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/xebotiparulegedenusel.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138812fcfcef---10031995244.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/zijuwadatixuka.pdfIn PDF document text
    • http://wohntraumgmbh.at/60662040427.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/dunut.pdfIn PDF document text
    • http://moristas.com/userfiles/files/88812226915.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/93263556072.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/gavuwotimejiwanis.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/544191364.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/rirexegowuxigixu.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210910_192222.pdfPDF link annotation
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/sigix.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/larijos.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/bibapugowukupemusodid.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/34958901871.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/61262145563.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/sogovafavobuduromok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=android+360+video+player+githubPDF 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_off0000ceae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAE 17736 bytes
SHA-256: 60331dee5721b9d3eb34a0b8fd82cd401dc131342d4661efaa9581660ff3a010
font_01_sfnt_off0000fd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11589 11368 bytes
SHA-256: 43adf1d235379305b8b3239eeffb9a5d85c9c83f655050115461c99d35afdbb9