Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56e3dde1f94f47d…

MALICIOUS

PDF

79.3 KB Created: 2021-09-20 09:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ad9865db461f9c9d42aa5f2e3fdbf009 SHA-1: ea52681ed2d1162f7d75c598357d2cbe510b1954 SHA-256: b56e3dde1f94f47de6bcff5cff595c81a49ca4f50081d257e847b8c14acfcaa8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://huntic.ru/uplcv?utm_term=haseen+dillruba+full+movie+download+filmywap PDF link annotation
    • https://ctsgroups.asia/images/file/zafisak.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109070947022172.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/saboroxawuniwaxab.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/lujerogopumevaredafape.pdfIn PDF document text
    • https://arerp.kr/data/file///64550641661.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/fanifatikebigisepopesobel.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/rejazunituvigo.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090718342873499.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/12070020602.pdfIn PDF document text
    • http://air-con.ru/upload/files/96666411637.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144d98b902a2---18835050523.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/85563426902.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/40249513398.pdfIn PDF document text
    • http://uhorder.com/upload/files/24693727810.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/mebuzipusawo.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/48442434092.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/16363783168.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/nogox.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/70787184261.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/53804390978.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/91198371231.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/welabawuwun.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/29392183097.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/6885846370.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/kipowidupebo.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/34525558567.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_off0000cb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB42 19440 bytes
SHA-256: 7792036f35dbf65ef8c62a26f49b843618b061917290e012599f33276c5cafae
font_01_sfnt_off0000fdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11616 11060 bytes
SHA-256: b4600de3871c872a4b4a8d03a3837783cd4f0329b660873a980251c9dfc23602

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