Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7433cc39c021037…

MALICIOUS

PDF

86.1 KB Created: 2021-09-20 22:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a09fc55b9927bf09edaf641b5ffaf185 SHA-1: 47872e89ea76f6266242ea5e8f187314bf80d948 SHA-256: e7433cc39c0210374b344dc92dc99543e54f92ea13ae3d5f8aa29223016bda90
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ClamAV detection and ML model output strongly indicate malicious intent, likely related to phishing or redirecting users to exploit kits or further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://mt-filtration.com/uploaded/file/20529436856131440853ec7.pdf In PDF document text
    • https://relans-nn.ru/images/docs/file/xuwatakori.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/pijosusopa.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/28190523507.pdfIn PDF document text
    • https://istanajp2.com/contents/files/35632999205.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/bupoluwuji.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/minizofilujopivene.pdfIn PDF document text
    • http://scsychem.com/upload/files/dunule.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/maxixu.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/26922329350.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/totipudibafawivekifoled.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/65478785376.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/jizeronolunum.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/38352412384.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/ladeturosipab.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/81380060439.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/goxakutotujuzatinorori.pdfIn PDF document text
    • http://honghuibio.com/d/files/gidatiwuworodato.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/64393634288.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613761a2c946c---bofilutifofuwegop.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/80685892652.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a65aaaad3---67482021216.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/xemamerufirebudekofigimo.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/46516178824.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/mamosalalow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+house+of+flying+daggers+full+moviePDF 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_off0000ea4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 10944 bytes
SHA-256: ac605be7df1a50381a8108ee548d754ebc889acc4e708a3777c79127aaa40741
font_02_sfnt_off00011b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B61 18208 bytes
SHA-256: b04038c6840a53a8fb8275f29eab1067086d1688fc8ee7f81a6d99a00e27f35c