Malicious PDF — malware analysis report

Static analysis result for SHA-256 16865f49478cd440…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 06:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac5c7df3633bea8ba8dc85107056d22e SHA-1: 5ddf0747a4d2de455f95e817e2b4432c54b778cc SHA-256: 16865f49478cd44047c3e30998824c73568b6fe5a12a77c30f2fd0ae54a3815b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the structure and embedded URLs suggest an attempt to redirect users to malicious content.

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 http://infrabud.eu/fckpliki/file/83870943854.pdf In PDF document text
    • http://joeun-it.com/userData/board/file/refego.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/pumetubijanaku.pdfIn PDF document text
    • http://lex.tj/img/file/wibovajebokezijo.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/wogaziji.pdfIn PDF document text
    • https://intersat.lv/files/file/vonadivorivezevavotenup.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/73053116915.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/48465609937.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/dulavukanupapu.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/fizuforaruwa.pdfIn PDF document text
    • https://cowik.pl/upload/92846391406.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/9865004161.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/9d8a44e1f37cbb80659969bd1e546b24/liruniza.pdfIn PDF document text
    • http://surtek.biz/image/files/20150329_085249.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12535960096.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/kezowapibupavuweduwiv.pdfIn PDF document text
    • https://fototipia.hu/files/files/koxilanefoxiwatuwirepiru.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7301d9dcdaae5a3f2e25e6cc22274952/xudesomipigigususinir.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/91235510012.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210912071221.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/97174894597.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/49439601789.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/dixumagotipitubaxekejuz.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/57473047937.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210909203730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=world+of+warcraft+ebooks+free+downloadPDF 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_off0000dc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4C 10688 bytes
SHA-256: c0b27c0140a58443c715a73590df5bf8cfedb16c2754b54077c8b476d99592e5
font_01_sfnt_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 16820 bytes
SHA-256: b96e257233aac10a603636c9ca0d6d97e01bf46e350bcfaee14216ef5a9584cb
font_02_sfnt_off00012016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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