Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e56d6d1734e4e1…

MALICIOUS

PDF

76.7 KB Created: 2021-04-02 23:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c35f15dd0c40b9430158dfcd8dc20a5a SHA-1: 2233b47f0238cbdd3f2e97f427868c729d6a8743 SHA-256: 68e56d6d1734e4e10b5fe6c4c089e69d2030e4187b2786c778e8b288649306a6
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to an SEO redirector. The primary redirector URL, https://mezovuduw.ru/strik?utm_term=3rd+grade+printables+free, is used in conjunction with an image lure to disguise the malicious intent. The presence of a large number of external links and the use of a redirector suggest an attempt to distribute malware or phish for information, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://mezovuduw.ru/strik?utm_term=3rd+grade+printables+free PDF link annotation
    • https://mekadademuru.weebly.com/uploads/1/3/4/3/134367219/35e6cc75d9f.pdfIn PDF document text
    • https://josudumebumokix.weebly.com/uploads/1/3/4/0/134040650/niwudujibibugalib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492574/normal_5fe162a9cfedd.pdfIn PDF document text
    • https://favujoki.weebly.com/uploads/1/3/5/3/135302790/e6ed3c2.pdfIn PDF document text
    • https://wedemewimobuxet.weebly.com/uploads/1/3/4/3/134309086/mawuzutobe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476765/normal_605bf99cc2b4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479224/normal_5fcb9627af3d7.pdfIn PDF document text
    • https://tomewulasanuful.weebly.com/uploads/1/3/1/6/131637374/gomowatit.pdfIn PDF document text
    • https://lupiwofuguneb.weebly.com/uploads/1/3/4/7/134715795/1688986.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415321/normal_5ff862c32b9a8.pdfIn PDF document text
    • https://bexokibuki.weebly.com/uploads/1/3/2/3/132302940/8599755.pdfIn PDF document text
    • https://fukaxoxatu.weebly.com/uploads/1/3/1/4/131438517/fuxifobo.pdfIn PDF document text
    • https://farejebizaf.weebly.com/uploads/1/3/0/8/130815013/1861027.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459029/normal_600ebcbe7d2f5.pdfIn PDF document text
    • https://balejumefem.weebly.com/uploads/1/3/0/8/130814467/2477e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/apache_hadoop_for_linux.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/sedefagadatav.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/95855256078.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/who_does_thomas_in_the_maze_runner_end_up_with.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/absolutely_anything_full_movie_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fee7ca4c-5142-4616-a43a-17a3aeaffc43/words_to_describe_rain_hitting_a_window.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99118339-760e-4a9c-a318-11ce22e83b77/giwuvizufe.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/kotuxowizoraxutijebita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00a68cab-f3f4-4c4c-9559-ba7724be8af2/rokisukupexejesokexomarif.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/auditoria_informatica_gonzalo_alonso_rivas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8228169c-0d77-4211-90ec-6cfd415867c1/is_a_declaration_of_trust_valid_after_marriage.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/spalding_60_glass_in-ground_adjustable_basketball_hoop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/044cebfc-7b65-4bfe-896e-5a0a3552eea6/kuniboza.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/wivas.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC59 5416 bytes
SHA-256: 755f0d858e6d1f40e145a10caef855d9f6e11bba89636a6a16aae044368c5177
font_01_sfnt_off0000fecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECC 11172 bytes
SHA-256: c04413d559ece9235f4723e5975c0605f66f78eb3174e6e156aafa6440d74db5