Malicious PDF — malware analysis report

Static analysis result for SHA-256 253bd469b711b5c8…

MALICIOUS

PDF

87.5 KB Created: 2021-03-24 16:03:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a99cb334ca519ff9c0ac0d189679d8f5 SHA-1: 3d16721c3391f78df0d75102077d6258f6b39766 SHA-256: 253bd469b711b5c88dfc41d0ba5a9c92df443ca74d940ea68e9f4ee0f2bec3f9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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://jacksth.ru/wix?keyword=apkpure+ucweb+mini PDF link annotation
    • http://zebrait.fun/computational_physics_mark_newman_free_download9ixg3.pdfIn PDF document text
    • http://hugertely.xyz/nifitavilsrt37.pdfIn PDF document text
    • http://istra-backwater.ru/buxujododr7.pdfIn PDF document text
    • http://m-ryanaf.site/bodas_de_sangue_marcos_valle0gqo4.pdfIn PDF document text
    • http://winoorama.website/901042642565w7df.pdfIn PDF document text
    • http://reduslim-sito.site/sijigitijumuxenapenevgcpht.pdfIn PDF document text
    • http://hangzhoumetal.ru/rogijiwemogawupudovavob6xmkl.pdfIn PDF document text
    • http://nasporte1.fun/pumobowokeje1ly97.pdfIn PDF document text
    • http://wibebilija.22web.org/kuwugoxoxojamafazewe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_e1cb8321585e40668e7311fb6053e29a.pdf?index=trueIn PDF document text
    • https://0a01f052-6ee6-4bfa-868d-d2e49373b03f.filesusr.com/ugd/55f640_05cb5b59c36b42ce9c719e384fb418e3.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_3e90956cd57040c091ab61bb08e11ec6.pdf?index=trueIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_fe39e5a37a834610bb8a96e19168bc92.pdf?index=trueIn PDF document text
    • http://sezusin.rf.gd/rasefituv.pdfIn PDF document text
    • https://cd5075e9-4951-46bd-8d13-413fdd501c9b.filesusr.com/ugd/eceaf1_eea738437f914c18a504fbf0016e14e8.pdf?index=trueIn PDF document text
    • https://38a589f5-619b-4230-bc7d-f88d9fc6dac5.filesusr.com/ugd/392051_fa676fcd5dda4bfbb5610094dbf2c2e9.pdf?index=trueIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_b1012b59655e4d66891c209047161f9c.pdf?index=trueIn PDF document text
    • http://mewudupite.epizy.com/82531620662.pdfIn PDF document text
    • https://0feddc0e-03bc-46a3-a741-45303deff239.filesusr.com/ugd/6ea6a2_70aedcbd644f43b992fec00e4c3e9610.pdf?index=trueIn PDF document text
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_b4ae190ed1ff4f21988093abcabe6610.pdf?index=trueIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_be61d196305846a4be1d518cccc07b36.pdf?index=trueIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_fff01ab877a44f2c8e9ec39c03a4b281.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34B 4944 bytes
SHA-256: 1ad959339dbe081b940a7ee4f62943533efe3cee463566be4e7ebac01ee0ed24
font_01_sfnt_off00010414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10414 3004 bytes
SHA-256: 6e9720d415843fdefe9563833fc940dec0f078ebb3fd020f2c09194eeccbff48
font_02_sfnt_off000110b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B0 12864 bytes
SHA-256: c045f327536be8f2e32290808d1e8830e11abb3a6f2a24fd46dd33df4cd339de
font_03_sfnt_off0001397c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397C 16480 bytes
SHA-256: 1d14af8f7a1cba66a6fc5f0910250bef057fb8f699cfb991132d4824bb20393c

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