Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b5a7e00790b8df…

MALICIOUS

PDF

80.2 KB Created: 2021-03-27 15:55:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cf41111b97a5271bbf596c06b1df90b2 SHA-1: 90064b79f7d61c50bb95db87ca2870bc0e386f66 SHA-256: 43b5a7e00790b8df29615fae7fb84ef2de27504dfbab849ee33a462684290be0
186 Risk Score

Malware Insights

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

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 0.9993

Heuristics 6

  • 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 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.
  • 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://crophysi.ru/strik?utm_term=life+expectancy+homeless+canada PDF link annotation
    • https://cdn.sqhk.co/gixejefi/6rjgsji/nes_duck_hunt_gun_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/ggghepy/carx_drift_racing_online_free_download_android.pdfIn PDF document text
    • https://cdn.sqhk.co/xogudililavo/7jgijhh/kogufiribalenetoxodakef.pdfIn PDF document text
    • http://eurozone.pro/how_to_get_procreate_pocket_for_free_20191qw9z.pdfIn PDF document text
    • http://raifaisentgo.online/jazz_bass_scales_tabshhca0.pdfIn PDF document text
    • http://servempieza.site/93459605585bjom7.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/iawifje/ludo_live_video.pdfIn PDF document text
    • http://train-home.ru/tswana_traditional_dance_videos10qjq.pdfIn PDF document text
    • http://help-business-media.com/wuwimasabunuporowafox8asor.pdfIn PDF document text
    • http://help-copyrightservice.xyz/37100298484xre0g.pdfIn PDF document text
    • https://cdn.sqhk.co/rubuxupab/Djhxzhb/63345573939.pdfIn PDF document text
    • http://50offshop.pro/98865446764lz90k.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/998590e7-1841-42a6-a109-b2d3d5c17923/how_much_honda_charge_for_service.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d0eb713-81c1-4464-b402-302e9c2edfdf/13875962780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d553bfd-6987-42b2-be8d-23ecb866dd51/kakoxezerazezisexigexom.pdfIn PDF document text
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_c45b81085f2f437b8da21453ae6245a8.pdf?index=trueIn PDF document text
    • https://2efabd41-1f95-43d0-8245-5f8eb9267247.filesusr.com/ugd/2f4ddf_29310e5d41064e708a0dbfe9390bae59.pdf?index=trueIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_e1c01ad06dbc45a5aa978a30af0d7a99.pdf?index=trueIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_f4b309eebc1b49c49c5b94b6b8cd38ab.pdf?index=trueIn PDF document text
    • https://f5ab370f-1445-465c-ae0a-adb246d340ff.filesusr.com/ugd/2d95ce_49600744677f42ccbe2538641ed2e083.pdf?index=trueIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_51f258cf763245a38762dbdaaa1edd8a.pdf?index=trueIn PDF document text
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_bd2acac7f84f45faa4cca78c00190663.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7d6b3fd-f939-4a84-9f8d-8ea67ce523e0/how_to_not_forgive_so_easily.pdfIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_c17ed55d406643afbaccabb5c88ece21.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_e0033e9ea7614a4fb6911f8c7b4848b6.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7B 5408 bytes
SHA-256: 07ac47ca128a104ce95f787febe1aa55bb4392b21c08e6065bdc2a6579a9ef4a
font_01_sfnt_off00010ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED3 10724 bytes
SHA-256: 234d61f52d4a915ae7febd609cb5351e974ab3aa840738b9e52e13f69c15a6b0