Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0b0f62f1fdf41d…

MALICIOUS

PDF

76.3 KB Created: 2021-04-06 16:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d15e9d1fb3c0914f4a03eff95f2cf18c SHA-1: 9bf4377392a03d96002a5f394bed2dbb588e6045 SHA-256: ae0b0f62f1fdf41df2f5d1f878367dd4ec1a37a0e49d40e629604ba2d76c1856
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm for SEO manipulation or malware distribution. The primary malicious URL identified is pelibifir.ru, which is likely used to host or redirect to a malicious payload. The ClamAV detection and ML classifier further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9634

Heuristics 4

  • 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
  • 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://pelibifir.ru/award?keyword=wordly+wise+3000+book+8+lesson+7+answer+key+pdf
    • https://suterigegopos.weebly.com/uploads/1/3/2/6/132695321/21b4d310ee2715.pdf
    • https://bazafegaxu.weebly.com/uploads/1/3/1/3/131383427/lowadolomad.pdf
    • https://cdn.sqhk.co/sojejinof/gh0vUZa/fujusinem.pdf
    • https://kegebexik.weebly.com/uploads/1/3/4/5/134590944/torekizi.pdf
    • https://cdn.sqhk.co/muwazubivotu/17bchax/sonic_ice_cream_sandwich_nutritional_information.pdf
    • https://cdn.sqhk.co/vejanozugova/JUgfsSD/chief_strategy_officer_job_description.pdf
    • https://mabobuloxulekev.weebly.com/uploads/1/3/4/6/134692970/bbc93f614a85c8e.pdf
    • https://cdn.sqhk.co/dabozijide/LF4Adhc/lyrical_lemonade_jordan_hoodie_release_date.pdf
    • https://cdn.sqhk.co/bebomopakax/2kDjfgj/lock_screen_among_us.pdf
    • https://cdn.sqhk.co/lomokubaf/hh2hZii/69330202255.pdf
    • https://lazezareb.weebly.com/uploads/1/3/4/3/134311903/gidopupunujoru_pumifulusi.pdf
    • https://cdn.sqhk.co/rubovadu/03XD6FV/56659928950.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_cf2dc6ed892542479849a401450b0412.pdf?index=true
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_76f0179589c045c4b8108b8b1b8af0a7.pdf?index=true
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_0c0888f6906b4010865227464a4acb0a.pdf?index=true
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_a2e3e691e1544424b23eb8bcedcd760d.pdf?index=true
    • https://c8019651-2137-4367-b38e-775fff3f8a75.filesusr.com/ugd/fc5a02_47cee3117d324a8981a52e3b3b638c24.pdf?index=true
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_7784af0e5fd84ce78bcc291f0b5d8033.pdf?index=true
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_271705f67a4e40639d223b3a7c42bde3.pdf?index=true
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_8f85b928a340401fbca8bf70237c45bd.pdf?index=true
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_ca0dbd6df925464bbd0e463da835918f.pdf?index=true
    • 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_off0000e238.bin
053f8bd51cf8b60787008bef634218ab5ba3bfa89aaa366a636ed03daae332de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE238 5736 bytes
font_01_sfnt_off0000f5de.bin
a3fe0eaa867c451333e2ff477158730aa58c9e435d6da8869a0dbdace9a6fb2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DE 10788 bytes
font_02_sfnt_off00011b25.bin
5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B25 16060 bytes

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