Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77bc34810c098a7…

MALICIOUS

PDF

84.5 KB Created: 2021-09-24 22:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a167d2d3fc42ac0ec56034e8c247e939 SHA-1: e2cb0f33712e7a08b8038a677cf0b4dec0a322cb SHA-256: e77bc34810c098a7c6ab9dd672b268b592f91d18cd22c1af747506cdaba4bbed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to disposable hosting and acting as link farms, strongly suggests a phishing or malware distribution campaign. The ML classifier also returned a high confidence score for maliciousness. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://inwebjor.ru/uplcv?utm_term=pes+20+offline+game+download PDF link annotation
    • http://mlight.cz/archiv/file/vuvivoki.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/10267303077.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/favekasitisow.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/gosudojoderozajas.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/28605857616.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/puwebojusetojufebufati.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/13997632506142c8357b3db.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/96385788230.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613808ec7d393---4474822080.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/gimofosu.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/lujiverarijak.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/i91npgfita75f35idpic3v8ub8/89754664036.pdfIn PDF document text
    • http://alcantara.cz/data/file/kinaveki.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37954785736.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/wapejofibopari.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210911_310875AA49AB3D81.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/49905204305.pdfIn PDF document text
    • http://antracit.topmebli.com/content/xuploadimages/file/33947429741.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/wutipajatipupak.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/8469858270.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/13204827778.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0698899001630686337.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D3 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34
font_01_sfnt_off0000da89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29B 21560 bytes
SHA-256: 6a6c6f3b48c26c099fe42d08b15db3c5fa1468d60ddf4fa8688c4580fcd83d12
font_03_sfnt_off00012b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3B 10828 bytes
SHA-256: 308c7224fc6e915ff18cfd77a970de51f2a7523e6196d330978262322c88740b

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