Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df312728744daa9…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 10:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1b94729dd7dee15d1a76e5766e41edb6 SHA-1: b82ba73b314d78a4b90c8c1f86d5544082d383ed SHA-256: 1df312728744daa95ce5c3d639b2eafa8b5dab9f8e165865c1c8168c04d8bbf4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with attempts to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://voszveszprem.hu/_user/file/bedafetagugoluginu.pdf In PDF document text
    • https://marblobaths.ph/app/webroot/img/files/remafefo.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/92865797262.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/melowu.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/38224469386.pdfIn PDF document text
    • http://esejsc.com/upload/files/dawuzinapizes.pdfIn PDF document text
    • http://tulga.ru/editor/files/90107347080.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/82653765125.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/35176639726.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/81968052155.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/zezoxis.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210915230209.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/98288270371.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/wugunovexekadagi.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/30304792554.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210908182358179.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/82148311505.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/92735393797.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/41269013061.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/wuxawosogilerito.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/pozagolexenevidi.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/dogazibezobug.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/fuvofasofatunukilo.pdfIn PDF document text
    • https://polaria.cz/images/file/tumarebemopukiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=share+photos+between+iphone+and+androidPDF 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_off0000ddc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DB 10744 bytes
SHA-256: cbf606c748acd8dcab9169f0113b7aa663d4947abab546c620b9f07ed253bc2d
font_02_sfnt_off00010e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E50 17936 bytes
SHA-256: 941df4e2a714fc067c658c8a539ac2a98b313a075175d3567af197fd25293833

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