Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56ac1c21d813a7f…

MALICIOUS

PDF

71.5 KB Created: 2021-03-29 07:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d5e55343468fb3e64fe0e80965fc5807 SHA-1: 10bd84ca6c5cb22de005574c64ca8e75bdc92d0d SHA-256: f56ac1c21d813a7f70763c4295bc1c6e8cdb560c80d7b7882dd2f2885a6cc4db
126 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains text related to 'caller id name address location app', which is likely a lure to entice users to click on the embedded malicious URLs. The ML classifier strongly indicated maliciousness, and the presence of numerous external links points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://botokaw.ru/123?utm_term=caller+id+name+address+location+app PDF link annotation
    • http://lirinevewafa.mypressonline.com/ibm_selectric_repair_near_me.pdfIn PDF document text
    • https://gilurabad.weebly.com/uploads/1/3/0/7/130775641/vimoj_kovejolibidop_suzudo_saweko.pdfIn PDF document text
    • https://vevusivo.weebly.com/uploads/1/3/0/8/130874001/d6866ad6.pdfIn PDF document text
    • https://xuvasilibozin.weebly.com/uploads/1/3/5/3/135335949/3277364.pdfIn PDF document text
    • http://xijivedijimidip.mygamesonline.org/kartilya_ng_katipunan_english.pdfIn PDF document text
    • http://rivijataban.22web.org/sierra_leone_auditor_general_report_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rokidibamufoduv.epizy.com/tarebufexikekala.pdfIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_ae4a83b7b8f4448092d559d206ff2a6f.pdf?index=trueIn PDF document text
    • http://zadedasex.epizy.com/how_do_i_download_the_bible_app.pdfIn PDF document text
    • https://19a4122d-28db-4ec2-a9e3-8c1e87f24dd5.filesusr.com/ugd/70d0b7_c3848073e48247439fea0defe07878c9.pdf?index=trueIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_4ced87ec368c4696905d254eb8f5072c.pdf?index=trueIn PDF document text
    • http://balazetesu.epizy.com/mamurupuvujanolamesedisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84dd7439-3162-4605-bf91-3ef320e84c11/67826930596.pdfIn PDF document text
    • http://mowesod.epizy.com/busoni_chaconne.pdfIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_603a818360654cfb9e9400ca20619c77.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/63eebc3a-19d8-404b-ba4e-b724c8f47a5c/what_is_the_main_idea_that_is_expressed_in_the_speech_aint_i_a_woman.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_off0000ddd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD6 5124 bytes
SHA-256: e8bd61a3df30d20e0821a205d231e36125897914cd4128f74d8ed662174a72b5
font_01_sfnt_off0000ef27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 9800 bytes
SHA-256: 45b65b9a5289b32ccecbea01028ee294e53d9bdd404667080f931cab515139d4

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