Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7dfce9bd9a6ee04…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 09:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 75111e77b85e906465d2751158651bc7 SHA-1: e1ccdc7cc0bb06601b6fd8ced0e8378a0254f4a8 SHA-256: f7dfce9bd9a6ee0413d86501a0a414c7e475e753982ca2ce53eaae50b3884c2c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files on potentially disposable domains, suggesting a link farm or redirection mechanism. The PDF structure and embedded content, though heavily obfuscated, are consistent with phishing or malware delivery lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://jumpinfit.it/userfiles/files/gesegilevukajadame.pdf In PDF document text
    • http://raylutickenterprises.com/userfiles/files/savemibadebiwenadi.pdfIn PDF document text
    • https://pecintajp.com/contents/files/dedidavafukom.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/lujekese.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/9153379776142c272eb745.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/9092481017.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/85744935398.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/nosobopibuk.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/witanul.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210901205430.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/zavirobazuwamesibuzejak.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/51351184965.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/pujugivegapirotiso.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/73246645405.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab0b737d78---44243477979.pdfIn PDF document text
    • https://ekransamara.ru/files/jenogemonipemikuzewoxara.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/nubog.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/bexug.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/9406841456.pdfIn PDF document text
    • http://reichspfarrer.sk/file/pumogugetivuj.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/nipew.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/burugoxel.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/35842117843.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/80680019905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=sync+email+with+android+phonePDF 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_off0000d90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90F 10888 bytes
SHA-256: c9475d6e86ff4a3a17dcc0e4369f2fb4497987d0412a139ea6e1e95850e9abfa
font_01_sfnt_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 17484 bytes
SHA-256: b227e2784207180153d591d87be62679e7c22366da3bec77a9cdc032efdfc896
font_02_sfnt_off00011ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1