Malicious PDF — malware analysis report

Static analysis result for SHA-256 a846a37a8e4350d6…

MALICIOUS

PDF

77.4 KB Created: 2021-03-14 09:25:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 82a347f2dbb9c0aa530f7c5b908897a0 SHA-1: d8ff6a15f42c54aa21c51bc8a9281fe1af816cd1 SHA-256: a846a37a8e4350d6c3db477c1b7ece62da9f0a320c262aa92e44528dd9387269
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://gimoguvi.ru/123?utm_term=bichagadu+telugu+movie+ringtones+free PDF link annotation
    • http://nekuwagibajese.getenjoyment.net/why_will_my_ps3_controller_not_charging.pdfIn PDF document text
    • http://fajamad.mypressonline.com/galiwejubaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392667/normal_5fcd612658863.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454046/normal_600397ceb546a.pdfIn PDF document text
    • http://dizititakozazi.mywebcommunity.org/ravished_by_a_highlander_paula_quinn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372719/normal_60418d04e22ce.pdfIn PDF document text
    • http://lifolibi.sportsontheweb.net/24310775027.pdfIn PDF document text
    • http://punejew.mygamesonline.org/mitsubishi_mr_slim_troubleshooting_no_heat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506200/normal_60445fbe4e150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_60184721c19d1.pdfIn PDF document text
    • http://vuwiwetidajin.mywebcommunity.org/kasivesibebokove.pdfIn PDF document text
    • http://tuzogat.sportsontheweb.net/how_to_reset_gm_anti_theft_system.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/biroteb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463807/normal_600fdbc29b470.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/scramble_for_africa_simulation_ppt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_ab8cd266c7c54168b6e6d36b82e03e28.pdf?index=trueIn PDF document text
    • http://domuromu.atwebpages.com/andhra_pradesh_bifurcation_act_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/agent_vinod_movie_720p_bluray.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/square_root_symbol_on_android_keyboard.pdfIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_e17fe3d057434c9681acc34b65e16513.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/lithermans_limited_misguided_angel.pdfIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_074a03e0f34c4d40982aef7fcc54ab28.pdf?index=trueIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_a98e7c81553f4e92b7a49bb37c441738.pdf?index=trueIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_8e0c83da3d2045fe951a1420db692fa2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/fovuzebuganujineri.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
    • 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD451 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off0000e536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE536 5544 bytes
SHA-256: 5152b66925355fff6a1a1451c5186aaad8612ee64e366dc86df444c8c5f2ff00
font_02_sfnt_off0000f7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 2356 bytes
SHA-256: b768c61f142124b6e0da79f310b03a8cf6105d5f275c7c6305312e520be604d7
font_03_sfnt_off000102cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CC 10428 bytes
SHA-256: b45112e91000f3decea839ff985ac0bcd6bda77f407a5174810efdd9d8756455