Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83cbb41349273db…

MALICIOUS

PDF

90.8 KB Created: 2021-09-23 23:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed2bb48eea5b281452dc64024eacb7d0 SHA-1: c6041be0b38719f5dd298b2d41ed116e7156596d SHA-256: d83cbb41349273db75db8fb6361e8f2b289783a275175e5bfa30b45c131718de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosts, suggesting a phishing or spamming operation. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://rachelrom.com/rescontent/file/zenowalepamimog.pdf In PDF document text
    • http://suamayphotocopy.net/userfiles/file/43298790349.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/kakugoz.pdfIn PDF document text
    • http://ailizia.com/userfiles/givekujupiwatefaboxozo.pdfIn PDF document text
    • https://dalba.net/other_files/File/gekukasajanatijibagififu.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613626f5ee662---zoxufa.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/72123262484.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/59623817473.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/42758192927.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9bd67902e---dorixu.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/80745693696.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/suzinumokisigareranemap.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/kijuraxilekizonuf.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/29568005072.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/xaxaditowagep.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/31303843227.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/8375531746.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/61831656334.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/negijapupi.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/70024622928.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/ripokobepedikakopat.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/41446563377.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/96065102276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=what+can+we+build+in+minecraftPDF 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_off0000feb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB4 17876 bytes
SHA-256: 0d3d7f58e2ed0640e5119fa9a0e122d5e6bb136be82304d1471ca2cf37ea3558
font_01_sfnt_off00012cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D7 10772 bytes
SHA-256: 5f55096cb20dd467088fe5443b6a0874de1f55a492a229c59b5f78de96b978cb

Open this report in the interactive analyzer, or submit your own file for analysis.