Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba55d857e706e8e…

MALICIOUS

PDF

71.3 KB Created: 2021-10-01 14:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4a99a4e7ec11bbccadea6057d9fdcec1 SHA-1: 4e7efc28187fbf9fbcc6067eb22bd082589b569f SHA-256: dba55d857e706e8e6031916e6fae11586ec226c051c24e6c21a110b0169b1de6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://synerhu.ru/uplcv?utm_term=bollywood+movies+downloader+apk PDF link annotation
    • https://economiadecomunion.com/ckfinder/userfiles/files/sixitufijij.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1632587423.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/96835553056.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5a1a68b67---wexanufisineto.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/73733495842.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/15144733870.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/4128689013.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/kiburezolen.pdfIn PDF document text
    • https://acerocorte.centralcms.cloud/galeria/files/28083125799.pdfIn PDF document text
    • https://baongochoa.com/upload/file/26304508976.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/63015571787.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/29012450881.pdfIn PDF document text
    • http://darstin.com/userfiles/files/kodarabawepezot.pdfIn PDF document text
    • http://gemtown88.com/PicOther/file/vorugos.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/74050676499.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/pavatadadub.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/81611090162.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/55507437980.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/27883508829.pdfIn PDF document text
    • https://isosklo.cz/uploads/68091264575.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161523231455d7---dunofajoridiper.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/bodutikol.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/26725196929.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/sulupofiwepoxilunusu.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_off0000b2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CD 16368 bytes
SHA-256: c159890cec8dcd5ecddf702cf72cbdf103f36c3baab5c50ed0cc2e1404f76dd6
font_01_sfnt_off0000dc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC46 10868 bytes
SHA-256: 02ccc75864af7e36684f35308fe4f3a7f87dd0e555032878992ab74aca4f3662
font_02_sfnt_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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