Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ca417084e559c0…

MALICIOUS

PDF

72.4 KB Created: 2021-09-17 13:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 675718b1a856ae92369ca0ab9f112e68 SHA-1: ee26e8448e4760ee4312a92c9eb9cffa35fe46a8 SHA-256: 09ca417084e559c0e67cb756210c0e367db6f2c9d142f8e9a2627b07e8c8bdd8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains, indicating a link farm designed to redirect users. The presence of external URIs and the overall structure suggest an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9680

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://drafthe.ru/uplcv?utm_term=tom+and+jerry+chlo%C3%AB+grace+moretz PDF link annotation
    • https://xedulichhaiphong.vn/images/news/files/71651569613.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/gadununoralemexidubotetip.pdfIn PDF document text
    • http://pottoka.info/files/galeria/files/worenilofipibufefusa.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/reribogaxuwome.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/92586359506.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/fazogovoripixibesofixiwa.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210911062904.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210909172444.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210916115908_id5s8v.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/18349440933.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614097ad962d1---76045040982.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/sufej.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/zisiwabajeduguroro.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/77073792895.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/tugexofofivoxujuravolato.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/vofapivimidu.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/95273188115.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af265755d---40703317646.pdfIn PDF document text
    • https://badoza.net/userfiles/file/84687278530.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210912_24E3A8B8F2CB3FC1.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/pomuv.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/xagexod.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/45237150588.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/15372569329.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/lowanupaw.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/vifixevu.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/manavitut.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_off0000b8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BF 15716 bytes
SHA-256: e166a11463d247ea13d352a7324f2699552df1f0f41415d4cc3417aebf6c8837
font_01_sfnt_off0000e086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89D 11052 bytes
SHA-256: 4c26451e14861c3b07355b3ddb075056c4b1869bd34fdbce9a2bb4d9093ef59a