Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3396624e2d6e04b…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 07:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3033cff6f626a087b41a1323e01ed0b6 SHA-1: bbddc23fdc1bfb002c1264c15594f3ccd551fce7 SHA-256: a3396624e2d6e04b921c55acddd69de6a666034a91a307c390d0d8977b835540
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs that redirect to various domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://philabc.ru/uplcv?utm_term=min+hero+tower+of+sages+friv PDF link annotation
    • http://chipgene.com/image/files/20210902_071511.pdfIn PDF document text
    • http://pmke.cz/pictures/files/67843981190.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/wetuzuwajoxekubutev.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/56300321473.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/nenefezonajumefelepilol.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/hjcqmv2kolqalig77v4lhb8ui6/jijavinenezeturabolon.pdfIn PDF document text
    • http://willbramephotography.com/rodusexaxajagagikipurune.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/31078213873.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/difapaf.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///gufavo.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/kapejurutukup.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/7057604719.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/pirafakudunutobavojas.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffcda464d9---97750860907.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/66364098722.pdfIn PDF document text
    • https://totounited.com/contents/files/46144345474.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2109132004481829626xnbwgj84398.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/fomewe.pdfIn PDF document text
    • https://hoavily.com/uploads/files/82957240069.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/pofofinaduvaruzukazuner.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_off0000d245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD245 10592 bytes
SHA-256: 0c62e971caac3a7b925d53a219b3f7782f55134828f4abd87a58222d02bf8e7e
font_01_sfnt_off0000ea8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001029c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029C 17896 bytes
SHA-256: 6f44b65885cfdd33d124cf0b14bac8462c1875fcdbee64af1d09c6f72d475daf

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