Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72760daa3d7c867…

MALICIOUS

PDF

77.4 KB Created: 2021-03-24 11:02:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0699e2ee8fc7470e0ed96db2e2ce7a71 SHA-1: b20d6d0d42e43393d8400d113b06023314828bfd SHA-256: d72760daa3d7c867f256f8e7875ca6ae0ba8a51da583e03be72b5bafe684fa15
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 heuristic firings reveal it contains a large number of external links, suggesting it's part of a link farm designed to direct users to potentially harmful websites. The primary malicious URL identified is https://nipisod.ru/wix?keyword=hush+app+apk.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/wix?keyword=hush+app+apk
    • https://cdn.sqhk.co/xuwolegu/hLDHigY/97320389282.pdf
    • https://fiwebafifike.weebly.com/uploads/1/3/4/8/134885554/b169a4835.pdf
    • https://cdn.sqhk.co/gajerivab/dibbQhj/83559682623.pdf
    • https://cdn.sqhk.co/vunofufi/heosGjh/bigot.pdf
    • https://cdn.sqhk.co/zojixemem/esgiijF/download_king_of_kungfu_fighter_apkpure.pdf
    • http://wotegop.22web.org/ropigoruturev.pdf
    • https://midodelawipage.weebly.com/uploads/1/3/4/5/134585137/a3774dbc3f9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/157fc949-7d76-4b17-9772-b8ae7f74ac8e/slue_foot_sue_story.pdf
    • https://s3.amazonaws.com/sikuva/norton_anthology_of_theory_and_criticism_3rd_edition_free_download.pdf
    • https://uploads.strikinglycdn.com/files/35970273-139c-426f-8269-e17883e4e14c/67033161945.pdf
    • http://nonomajemiw.rf.gd/sejarah_agama_yahudi.pdf
    • http://fesemuk.rf.gd/99386745074.pdf
    • https://s3.amazonaws.com/fejakixoweka/merumagibopi.pdf
    • https://s3.amazonaws.com/bulikowexunepov/vlookup_example_between_multiple_sheets.pdf
    • https://uploads.strikinglycdn.com/files/4659217d-3e1e-47d9-888d-499b67b8348b/veeder_root_tls-300c_not_printing.pdf
    • http://viwefar.rf.gd/69183951861.pdf
    • https://uploads.strikinglycdn.com/files/6f6a307d-2e82-4b00-b9d6-a041631ab729/what_is_iso_27001.pdf
    • https://s3.amazonaws.com/jolunenafobuw/82307053784.pdf
    • http://nizarajizigutut.epizy.com/48225490059.pdf
    • https://uploads.strikinglycdn.com/files/ad104644-a9d1-43bc-8f43-1b7adbc29b13/how_to_draw_anime_cat_girl_step_by_step.pdf
    • https://s3.amazonaws.com/zozuxukoxo/alter_ego_b1_cahier_d_activits_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f374.bin
d4566f0871ed26fdf8a5fe76965c12bdcb4d5145070ebe6a002bcfa080b2b6c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF374 4804 bytes
font_01_sfnt_off000103cb.bin
c24e595ee8b45be51d7fd778552ff2ee0c83cae64bada27590630fe60de6e23b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103CB 10864 bytes

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