Malicious PDF — malware analysis report

Static analysis result for SHA-256 778b5c61ee93e48c…

MALICIOUS

PDF

90.0 KB Created: 2021-06-09 20:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7af03070a9c5cf6209ec057e4656578b SHA-1: 1caae4aa842f3cd35b309995ff73eefd35f49122 SHA-256: 778b5c61ee93e48ca722e6a6585c36a9b50479b83e8199417eb46911f9fd1c40
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 0.9961

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://huntic.ru/pbw?utm_term=lk21+fast+and+furious+8 PDF link annotation
    • https://dekudabor.weebly.com/uploads/1/3/4/8/134893804/dokegexofoxiga-futeven-gefugoginebof-seketag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380088/normal_5feb62495046c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452382/normal_602268add6c0d.pdfIn PDF document text
    • https://worofinuwur.weebly.com/uploads/1/3/4/5/134582463/gapivosiwu_vijuvonaxeve_kumiruji_setiza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413235/normal_5fcf0d1b242f2.pdfIn PDF document text
    • https://xugimitedekilim.weebly.com/uploads/1/3/1/4/131482884/8331514.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392853/normal_600406b80d8fc.pdfIn PDF document text
    • https://kilekefaze.weebly.com/uploads/1/3/4/6/134631798/sasavetixubawev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446401/normal_604939b94e7b3.pdfIn PDF document text
    • https://lubumona.weebly.com/uploads/1/3/4/6/134648672/2373088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418570/normal_6014584b14664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450434/normal_6016df2c34d8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492897/normal_5ff8477751351.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/949db2c3-ead3-4750-af14-a522bd5d016f/natural_life_coupon_code_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcec4217-a521-4a90-bd61-026d0ea163b1/mezetododanekuza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca556dd5-e569-4df2-8080-1f700b123c8a/alphazero_for_android_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fadf4ef-b2ee-4aff-867c-8aca478123ac/45918504197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e183fd19-0175-4b8b-90f8-e48b4a134200/31136497147.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed76fb4c-0ebd-43ca-9a56-34832574c98f/chatal_band_music_mp3_naa_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22d7258d-e367-44f6-9fcd-7bea655f2bcf/smoothie_with_yogurt_water_and_frozen_fruit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e98c5a54-2dec-4321-b8a4-2fbc9b8239a7/82662270684.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af3a0b3c-f39d-42c1-9f61-d45bbea0d79b/jarewam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ba85bef-3f9d-42be-8f09-d7fa5ea30b8c/20908302077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abac255f-38cd-46ec-8bbf-bca48c28cce6/62434850762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01527fc4-ccd6-47cd-b3d3-dc8610a5e18b/how_to_start_a_generac_power_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/663da856-89a3-451f-914c-5152c4b0a593/xagerakuxezazesu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12034 5252 bytes
SHA-256: d585457f6efda60beee483fc346b01f510f96bfe31870d37c5f021f576c32bea
font_01_sfnt_off00013228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13228 12120 bytes
SHA-256: 6adc6194d6f7b081e6e75dcb41bd14b4e34443269f05f8d3f255004d7f8e2d56