Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c84f78411116049…

MALICIOUS

PDF

105.6 KB Created: 2021-04-14 07:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3378d19f403a01417350dded42b31708 SHA-1: 88f4281c1d9d9d847db2c03767731117a0073985 SHA-256: 3c84f78411116049b52a69e643d6d06822b8a368a726ac63aeb60079a41f4977
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://fokemale.ru/strik?utm_term=author%2527s+purpose+worksheet+pdf PDF link annotation
    • http://sochi2026.com/bewikuriwonowbv672.pdfIn PDF document text
    • http://sarhello.online/loud_dog_barking_ringtonehr6w9.pdfIn PDF document text
    • http://shishkin-seed.xyz/23696335652u76zw.pdfIn PDF document text
    • http://streichpack.online/47193095033f5u9n.pdfIn PDF document text
    • http://copyrightsupport-ig.com/keep_notes_app_not_syncingn7b05.pdfIn PDF document text
    • http://ejinaya.com/semixizodijivb30z.pdfIn PDF document text
    • http://i-men.ru/how_to_factory_reset_moto_g_3rd_gen7u7fg.pdfIn PDF document text
    • http://it50disconto.pro/70999003501vs4wa.pdfIn PDF document text
    • http://testvvd.xyz/93304931441q6lfb.pdfIn PDF document text
    • http://jewlgems.com/fopezidiregeterijalemy7gp.pdfIn PDF document text
    • http://leoidet.xyz/5213803668441bgh.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/Xibihhb/javavonupomirezi.pdfIn PDF document text
    • http://1fps.ru/anthracnose_of_grapesre5ur.pdfIn PDF document text
    • http://studyweb.site/pofemimur5j90w.pdfIn PDF document text
    • https://cdn.sqhk.co/kusewupudin/0PLQu4a/clue_detective_notes_printable.pdfIn PDF document text
    • http://moshon.space/your_health_today_choices_in_a_changing_society6ldax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_96119d17948a4a7b98a3ab6ab2441534.pdf?index=trueIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_8330f7619f6044daafa471b3b15c9adb.pdf?index=trueIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_538f6f229d414e71b44762856e8aa52f.pdf?index=trueIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_063ce5e827ea481e982971780e44c5fb.pdf?index=trueIn PDF document text
    • https://246406bc-bb0d-4f29-baed-d8a6153a9543.filesusr.com/ugd/3ddeef_56ec42e96708424d974a5d81a44b58a9.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off00013901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13901 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off000148f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F5 5064 bytes
SHA-256: 39b3926086db2af954610fba7a20428e24615c213678cd3063618bedc022142b
font_02_sfnt_off00015a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A44 11644 bytes
SHA-256: e1dbb4537527afe8de97787d610812537218752dbc0cd6a2a9a17c2dba578a7b
font_03_sfnt_off00018209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18209 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2