Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8acd8a56c660e57…

MALICIOUS

PDF

90.2 KB Created: 2021-05-07 10:40:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 76311b8a250df67d9d272c8fe6c879e5 SHA-1: 9c3184e61e9a0cef3421cf0f020d9e810004d167 SHA-256: c8acd8a56c660e57897dd563f8d723ec9d424f845df807ea53b4bac5edf952e0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=shred+max+pro+reviews PDF link annotation
    • http://trokot-shopnew.online/97381519419bgcae.pdfIn PDF document text
    • http://fodefon.getenjoyment.net/camera_angles_shots_and_movements.pdfIn PDF document text
    • http://testrun.ru/what_car_seats_are_compatible_with_city_mini_gt2ra9t7.pdfIn PDF document text
    • http://dedigevobunobe.medianewsonline.com/el_solipsismo.pdfIn PDF document text
    • http://igonlinesupport.com/wunexobomisodanejezejikij9mg5.pdfIn PDF document text
    • http://xakaderinetatu.mygamesonline.org/84014901058.pdfIn PDF document text
    • https://cdn.sqhk.co/mivijigonof/rtYsjaW/wetorataniwubeboxijibe.pdfIn PDF document text
    • http://ita-yog.space/how_do_i_reset_slingbox_remotelyg2ack.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/zxi5Ojh/zosiwupegekege.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://vukepomekavedi.22web.org/75494218831.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1435a5b-0e11-433d-bf54-8316c6187ebb/how_to_get_through_navy_seal_training.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/37699809652.pdfIn PDF document text
    • http://titikikero.rf.gd/97503367211.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0db9e90f-c412-4454-8ce5-f2a918479839/flir_one_android_app_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37ed1bc9-84b7-4af9-9e26-6a4e21871727/discipline_equals_freedom_book_depository.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e767330-3aea-411f-8575-70de00b79fa6/sigedade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08f52c3d-2cbc-46cf-9a1e-35a057536253/how_do_i_use_m_audio_keystation_49e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ab0528f-d641-451b-b408-5c341139249b/dexufuketikize.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_off0001033f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033F 6872 bytes
SHA-256: cfd810a5ea282119da4c1abf509a1e6bf8c77e42bfdbea3e308bbcdcc7c40f73
font_01_sfnt_off00011495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11495 5492 bytes
SHA-256: f2dc98fe5755741123defa78d21ccad01c85cf1a016160a8aa6faf8e859d4b29
font_02_sfnt_off0001271b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271B 3216 bytes
SHA-256: f2fc96b82973cb06c93aa906c70504ec4365b4f186da87c2dd1a712f07fd1811
font_03_sfnt_off00013449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13449 10864 bytes
SHA-256: 5c5ab04ad95d5a298151b99496e78de94701daefd51e71e801e1fedc12172d11

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