Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf80db8ff416381…

MALICIOUS

PDF

77.4 KB Created: 2021-09-13 02:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7a0d7dc5effb8189231ba43ace3d85a1 SHA-1: 09e359e83b12e122af42e4c10cd94a5d9044a69d SHA-256: fdf80db8ff416381b665749bfadd2722170ec74bb4a40e26b78a369f31ec574e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded links pointing to various domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF acts as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pistant.ru/uplcv?utm_term=ayla+the+daughter+of+war+full+movie+english+subtitles PDF link annotation
    • http://dolonchem.com/upload/files/25213562855.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/70308482234.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/vegenosematitafotut.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/44249398473.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/90644867648.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9f648b0b---60704404833.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/29297315502.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ezomaje.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/mogowukoturep.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/rowiwumujinod.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/89885324878.pdfIn PDF document text
    • http://rinsacars.com/files/others/fesajefekuka.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/bilumamijox.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/fozafunexekikagujuxupo.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/35689949654.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/28114779456.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210902/files/20210902184644.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/posavujokajilimuxebub.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/pokurakamufisupe.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/35366240536.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/wumozopo.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/44065703385.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/xinunem.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132bbb36da39---50872918988.pdfIn PDF document text
    • 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_off0000bc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC92 11288 bytes
SHA-256: 448e6a0642e77ee56c15acd6106e272c7c3f262f882e8ff613c8081729ea33e8
font_01_sfnt_off0000d6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 22056 bytes
SHA-256: bb8febac137c776b58b23d01b38f313de30f0132b8f146332486f7330a9ec3a3