Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe8e7655b76405c…

MALICIOUS

PDF

83.1 KB Created: 2021-03-17 02:12:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 485e8653072d680971dd52d9c136ba98 SHA-1: b223eb8cd830c7cdc429c9fe9f18f6212977a846 SHA-256: fbe8e7655b76405cee27a4b520eb854704cc3154fdbbee17bcd7b5c1a07a1336
156 Risk Score

Malware Insights

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

The PDF contains an embedded URI that redirects to a website related to 'unifi ap password recovery', suggesting a phishing or scam attempt. The PDF also contains a large number of external links, many of which are SEO-themed, indicating a link farm strategy. ClamAV detected the file as Pdf.Phishing.Trojan, and ML classification strongly supports this verdict.

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.
  • 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=unifi+ap+password+recovery
    • https://cdn-cms.f-static.net/uploads/4481272/normal_603ae6a8ac649.pdf
    • https://static.s123-cdn-static.com/uploads/4495558/normal_5ff0cdc8b72e8.pdf
    • https://zuborezebakit.weebly.com/uploads/1/3/4/6/134638686/bitawubigowuf_sedidon_nezurizum.pdf
    • https://xizilajonufu.weebly.com/uploads/1/3/4/5/134528384/dovumugoku_nezixilix_xoboragog_fuvon.pdf
    • https://cdn-cms.f-static.net/uploads/4494433/normal_5fe76f38a126a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jalasilunaz/what_is_the_fastest_verizon_fios_router.pdf
    • https://s3.amazonaws.com/bikikanafopavu/wedding_reception_timeline_of_events_template.pdf
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_897cea9c9d2c437f80c2174cd0f0fc56.pdf?index=true
    • https://fb4bdcd3-28a3-4206-a6c3-fb267f511c23.filesusr.com/ugd/0ad562_ffba1d2a783342148307bad4271c9366.pdf?index=true
    • http://pebomotixot.myartsonline.com/how_to_reset_element_tv_remote.pdf
    • https://s3.amazonaws.com/fosagobomap/96505815566.pdf
    • https://s3.amazonaws.com/sigobija/sewirizobeviruxavosak.pdf
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_29f65ad25f17459185111187d41702b8.pdf?index=true
    • https://5b3500e9-40b4-440a-9ada-171ed8bcf4c9.filesusr.com/ugd/7820d0_94aa188c832b474185abda949ba0ccec.pdf?index=true
    • http://rofuvawitarul.atwebpages.com/9002240863.pdf
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_6a503edda92a405ebcaa996954b06cdc.pdf?index=true
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_967f4286c8fc429b8e63a5b4b5287a18.pdf?index=true
    • https://s3.amazonaws.com/pibajuwi/where_is_wps_button_on_netgear_n600_router.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb9.bin
deecac7e74c601e2852b5cd927aad1700ecb0e7623a5a9c05a2663dffd0fc282		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB9 5364 bytes
font_01_sfnt_off00010029.bin
23f4790d01ed13464265bcd32c0abef2f5c6999ca16fe9a1314e53c126c87f54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10029 11616 bytes
font_02_sfnt_off000127d2.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127D2 16204 bytes

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