Malicious PDF — malware analysis report

Static analysis result for SHA-256 abccd817fc7722f3…

MALICIOUS

PDF

82.5 KB Created: 2021-04-04 18:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73234026fc014436d94fcb65568cbd1f SHA-1: aad83afc0ee04c1857f8fad5b95f1c979838b921 SHA-256: abccd817fc7722f35566fdf36d25dd20ee6e87b64ffc43b0d465b0ace514625f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary malicious activity appears to be directing users to external websites, potentially for phishing or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/wix?keyword=arc+length-sector+area+wells+worksheet+%2528w2%2529
    • https://xuzijobozu.weebly.com/uploads/1/3/1/4/131411245/rewuwoju_fagawalef_lenisoxes.pdf
    • https://cdn.sqhk.co/fudopalizew/gjiVgcK/vifiru.pdf
    • https://cdn.sqhk.co/zasemewiti/eME5GJd/38159387922.pdf
    • https://vogovolakufa.weebly.com/uploads/1/3/4/8/134874318/jivuje_zenarulod.pdf
    • https://cdn.sqhk.co/fefowofuk/Y9jh9id/86820775034.pdf
    • http://putijeku.22web.org/canon_eos_rebel_t5i_manual_espaol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_bd7bcb445f4e4e89ba269d6e2934e409.pdf?index=true
    • http://duwimufowewis.epizy.com/the_good_the_bad_and_the_ugly_sheet_music_orchestra.pdf
    • http://xugibomexepef.rf.gd/2018_sea_doo_rxt_x_300_service_manual.pdf
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_0784b090c2c2492ebd0229bd2958733c.pdf?index=true
    • http://mopuminamopox.epizy.com/31888396249.pdf
    • https://uploads.strikinglycdn.com/files/943e5676-3fac-4b43-b5f2-a42fd418f6e6/how_many_calories_in_a_large_chili_cheese_tots_from_sonic.pdf
    • https://uploads.strikinglycdn.com/files/6655c3a3-95f3-44bc-aabf-464cd176ac5a/turnigy_9x_compatible_receivers.pdf
    • https://uploads.strikinglycdn.com/files/af3a91ba-4409-4c84-b803-3c1026ad4e70/xuwinodita.pdf
    • https://uploads.strikinglycdn.com/files/d5936ad9-c3f1-4f52-acd7-fc544982b15e/hp_envy_4500_ink_cartridge_stuck.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3e7.bin
a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E7 6440 bytes
font_01_sfnt_off0000e3aa.bin
feb7b0a231daa5869376ede745e3710e8328e703e54e7a1fa61048461e3e1f84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AA 2864 bytes
font_02_sfnt_off0000edda.bin
7da387fa815ed10bacd09df029df045600567c99239a1fe4bb7e995ab5bf6175		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 5524 bytes
font_03_sfnt_off000100c6.bin
503015feb9a5f9b1c78ddcf5abf89458e2824824568962cac66a9b6104490653		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100C6 11116 bytes
font_04_sfnt_off00012694.bin
33cbbabcb9c0313c14708adc1c9e6739c0fce993425c6db46a8bb2e3db34ad9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12694 16172 bytes

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