Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1800412fe3f4654…

MALICIOUS

PDF

80.1 KB Created: 2021-09-14 00:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e865367490dc83a8f1d8e436a6cb1dbd SHA-1: 30cdf06a2d879df537d8091c7098c0918f41ce4e SHA-256: c1800412fe3f4654ad3df247247603a1b9014f1cab42c2015af5bcc816e27dcd
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It impersonates a cloud document lure, attempting to trick users into clicking embedded links. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt, likely leveraging a vulnerability or social engineering to execute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://www.hausbaumesse.at/ckfinder/userfiles/files/10010812693.pdf In PDF document text
    • http://lnianemarzenie.pl/userfiles/file/wepezudegiluxusukek.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/4763233272.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/mituvitoko.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/dijijuga.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/nuleduraketubalotev.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/31076836946.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/6507583842.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/90978983281.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/logezelofalofazififexaw.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/84445779701.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/33429741447.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/96862794341.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/mg1jaed5fem83gn4jp48mnhl1i/20301581323.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/magufevexedatewodej.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/lopulapijoduxag.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/wixiwajubunasifirosureziw.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/78886717162.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210910222051_h3jn73.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/mederotovapimugipan.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/fixulevuzoxorobogaxiri.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/savipugodopividarokubi.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/misurabasub.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/59d1137d334a40e5f265c13219ae17a4/taxasimugikigufakikoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mi+note+3+pro+flash+filePDF 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_off0000d616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD616 16980 bytes
SHA-256: 04422ace36f7ff45bfa6f7b06097b514d9bd1b86fcf09919703bb472ae17e80c
font_01_sfnt_off00010279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A90 10620 bytes
SHA-256: 956fad1fece3bb91ff23bb14de699f57402f79f5974c761046e76ffa32cddc93