Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7fdceb9f1ec395e…

MALICIOUS

PDF

70.0 KB Created: 2021-09-30 22:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 559200490bf871dbe55187f30697d08d SHA-1: 3d43ea6de3b8647b036bed3414d973d81723a6f4 SHA-256: a7fdceb9f1ec395e6a3c7470a51245b12ad3b639f57ec7d4387c8769f0a7e584
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://clean-ecology.com/Upload/files/41801113323.pdf In PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/81579510255.pdfIn PDF document text
    • http://www.pilartangguh.com/file/kiwapejuwibukijefipu.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/9091942358.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/bafizuzigadixi.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/movatubogisubepizogatete.pdfIn PDF document text
    • https://wittnebel.dk/file/favodamitumaf.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/8889337400.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/sizusidenigagowomefijowo.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/74255877675.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/bulolavar.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/xapet.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/zugoniwel.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/11062767423.pdfIn PDF document text
    • https://ysh.my/userfiles/file/muzosinok.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/4555125601.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/wipapimamixewovera.pdfIn PDF document text
    • https://adfaveo.com/image/files/20210925_140125.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/nezimonuzogud.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/wezija.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/xexiwu.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/xubugavumadogokipazojuzin.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/fejirukajuzilavodexuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cash+papa+apkPDF 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_off0000afee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEE 17488 bytes
SHA-256: 8327788d76d397b032af41875e391c1b6177251e10f4b66f0e1f653035ac6fce
font_01_sfnt_off0000dd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 9780 bytes
SHA-256: 31a5831afd4f69e57133c391584781dfd0150c6b3015b1b4620c575619361502

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