Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ca95ea4afaf3fb…

MALICIOUS

PDF

76.7 KB Created: 2021-05-17 06:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 15e0bc4497e6c451106b4d24c83a44e2 SHA-1: d177042306af8906d9c5edc1f4581a009760a0e6 SHA-256: 53ca95ea4afaf3fbbd94cc4ef8e33f75fa90657eb1cddce0bd4625524f11bca3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The primary attack pattern observed is the creation of a link farm with numerous external PDF URLs, likely to manipulate search engine results or host further malicious content. The heuristic 'PDF_SEO_LINK_FARM' specifically highlights this behavior, pointing to URLs like http://goladelexugezi.sportsontheweb.net/5387980597.pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://jacksth.ru/strik?utm_term=carbs+in+1+taco+bell+chicken+quesadilla PDF link annotation
    • http://goladelexugezi.sportsontheweb.net/5387980597.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/bizapumozuxuxodagixe.pdfIn PDF document text
    • http://zukirudon.mypressonline.com/cg_tet_answer_key_2020_download.pdfIn PDF document text
    • http://jedufozares.22web.org/securecrt_crack_windows_7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zodumokosijupe.epizy.com/27465326957.pdfIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_64acd4ab5f7b49df8f9d4416ff741e53.pdf?index=trueIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_d500651c834a4a9bb03678e72657f54f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/ridukepilapejuteju.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/16695678729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edadcefd-d5a2-40f0-9020-15df3278162c/34995505523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbdc3aee-80d3-4ece-9bbe-41e00d673ca7/king_rat_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/sql_server_2008_express_sp3.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/bmw_x3_2008_radio_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/918021e1-58bf-4cc8-b923-0b66b45997d1/how_to_do_pencil_sketch_for_beginners.pdfIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_52e521122ad44dbc9a822f38700c6009.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8ca727c-bcf7-4fbb-b50f-dffb966d52d4/tedezanibu.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_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 5316 bytes
SHA-256: 3e915d5d9729a5ce74a646f0b8a6e0cf24c7825ff32df9592f47f240bde142ab
font_01_sfnt_off00010090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10090 11048 bytes
SHA-256: f3eddb65b026fe36b063699de662658ef362320d23cede73ecf0fde076b0674b

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