Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d9bf9be9b5338ac…

MALICIOUS

PDF

71.4 KB Created: 2021-09-24 21:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1e86c0dfd61e6f076e334a67134f0d95 SHA-1: 184cd5e3340b313c899cd24874c357c2bec5e1db SHA-256: 7d9bf9be9b5338ac72348e94a187dc5f18916fec78fc973e2514ac65c525fbec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs pointing to various domains, many of which appear to be link farms or disposable hosting, suggesting a phishing or malware distribution campaign. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates the document's purpose is to host many links on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=totok+available+countries+ios PDF link annotation
    • http://app0.linkeo.it/ckfinder/userfiles/files/68601221251.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/zobozino.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/79868616312.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614856691fba0---96613897769.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/lugor.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/51468815354.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/91652043892.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/vemozasirifali.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/makixabewotifip.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/86508635744.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/44855283632.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/lugib.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/78382154854.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/xawuvenejagoderimufer.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/79470932307.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/85121695968.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/fufaxipesuvosikilukavujim.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/49222488961.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff1ead9966---vufax.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/84580038303.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/narobax.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/61783658124.pdfIn PDF document text
    • https://mkontroll.hu/File/51102330657.pdfIn PDF document text
    • https://tch.lu/files/files/fufesonuzovava.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/lawoli.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_off0000b32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB44 10584 bytes
SHA-256: d73634ad1636c7c359051db4cc73cb3bd7e7f893f4f3f5ea43e52d428249a8a9
font_02_sfnt_off0000e3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A6 17380 bytes
SHA-256: dfe07802b6e43b60aa55d64db199d820a0a09f47f78b83013992af7bb73d0f84

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