Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcee44f6410c8bcb…

MALICIOUS

PDF

68.4 KB Created: 2021-10-04 02:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9c979c52496cd5911ba833ad54d23e9b SHA-1: 4f05a17ade3b88a85bb0a8417e9bd129029703e6 SHA-256: dcee44f6410c8bcb918012d03097777b81703859774856b92de7a29e0dbb39a7
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating a malformed exploit stream and a link farm on disposable hosting. The document contains numerous embedded URLs, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF format can embed JavaScript, which is often used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://pixomot.ru/uplcv?utm_term=life+is+hot+in+cracktown+book+movie PDF link annotation
    • https://biocoils.com/img/file/17309324920.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/63475244490.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/36402271997.pdfIn PDF document text
    • http://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/xinefetimij.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/finazelakitiludo.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/fipudofekaxekaliniron.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/95867069574.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/25261859399.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/wimirusotulux.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/71924737532.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/40782105896.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/12527098580.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/uqnkre0bgc076h3ju4to43qekv/faruxagumoxo.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/31396450060.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/rtfb71g1v7m93s5vf47trha8vk/21108679596.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/melugaralilovirenelogegi.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/96341288752.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/11826358274.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/70464327215.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/papanuram.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/95504349222.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_off0000abdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EE 14892 bytes
SHA-256: e0ce2ace3283249439ec2d425bfd9f74658573dc9428e632a70279b66524b851
font_02_sfnt_off0000e99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99B 10896 bytes
SHA-256: 98ce2f067f8d9623a40199de298f9a71e21f2bd65de2d5c3be0e027bd4e91410