Malicious PDF — malware analysis report

Static analysis result for SHA-256 c574e86b578baf5c…

MALICIOUS

PDF

78.1 KB Created: 2021-04-02 07:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6d394bc2e164ab4181c597cceb16da33 SHA-1: 21d536e08341a8e83b0f2e7c5b2ae90ee43eb483 SHA-256: c574e86b578baf5c1ef731c117c2a3a5f9340d5efb87d466c3840e3b0cb24283
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'casual leave form in tamil' and 'wkhtmltopdf', indicating a lure to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=casual+leave+form+in+tamil PDF link annotation
    • http://kudikadip.getenjoyment.net/92150898329.pdfIn PDF document text
    • https://cdn.sqhk.co/zoburawava/dgSjf2c/last_call_for_duty_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/jjifBdx/burger_king_near_me_breakfast_menu.pdfIn PDF document text
    • http://pinezotamex.getenjoyment.net/93618362084.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/perbedaan_bronkitis_akut_dan_kronis.pdfIn PDF document text
    • http://xofenejilomoz.iblogger.org/portrait_photography_posing_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/ggi88lM/fegadexo.pdfIn PDF document text
    • http://nufudaluwunuja.22web.org/why_is_my_printer_not_printing_on_the_whole_page.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tudozujuxijoz.rf.gd/86590315631.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/my_passport_ultra_4tb_specs.pdfIn PDF document text
    • http://sudisededokop.epizy.com/the_other_side_of_the_door_movie_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/75195060327.pdfIn PDF document text
    • http://bopijugixuxum.epizy.com/gemobinefig.pdfIn PDF document text
    • http://tadidemoribezor.epizy.com/brush_calligraphy_templates.pdfIn PDF document text
    • http://jinixoxugud.rf.gd/19350237629.pdfIn PDF document text
    • http://jolatuziguxobe.rf.gd/acronis_backup_12._5_admin_guide.pdfIn PDF document text
    • http://manuzuwefegovev.epizy.com/xodegalusiwelinufu.pdfIn PDF document text
    • http://kuwosuz.rf.gd/nobuzofa.pdfIn PDF document text
    • http://luderaguzafa.epizy.com/19886474709.pdfIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000d9c2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD9C2 11272 bytes
SHA-256: 90bf5d872e7ade3b2f8d31d861566cca396745ece795467f35cd6e6d9b2b7bed
font_00_sfnt_off0000c940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC940 4880 bytes
SHA-256: 8a5efae7240c1dac48d0001b09dc6b92fc3ef729e69db3704e61107e63e66eaa
font_02_sfnt_off0000f75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 10404 bytes
SHA-256: 343b1133833b6da662eb5ce1506028d0d0f353447d6421c790fc638a1b65559e
font_03_sfnt_off00011b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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