Malicious PDF — malware analysis report

Static analysis result for SHA-256 1957374a760a7cf7…

MALICIOUS

PDF

79.0 KB Created: 2021-05-30 18:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ad1c89c764dee21da2793fa8e2162b19 SHA-1: 52c828529dd50b4be018b15a2e39ef4e7542f904 SHA-256: 1957374a760a7cf7764de1f26bbdeb0e61d8804985f26c1ad70af9d8d683dfee
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 0.9997

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 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://fokemale.ru/strik?utm_term=festival+internacional+de+m%25C3%25BAsica+y+danza+ciudad+de+%25C3%25BAbeda PDF link annotation
    • https://ziperibeletoru.weebly.com/uploads/1/3/4/7/134761266/f174f4d25b038.pdfIn PDF document text
    • https://susulipazelavig.weebly.com/uploads/1/3/5/3/135335994/c842636d7fee6.pdfIn PDF document text
    • https://nilelaji.weebly.com/uploads/1/3/0/7/130775665/46d2bb602.pdfIn PDF document text
    • https://gagafilesiruw.weebly.com/uploads/1/3/4/8/134886729/5009832.pdfIn PDF document text
    • https://wunaramalus.weebly.com/uploads/1/3/4/5/134576193/201838f32e.pdfIn PDF document text
    • https://xojojesiz.weebly.com/uploads/1/3/4/2/134235357/0aa169d403f5c80.pdfIn PDF document text
    • https://zakisegozazamig.weebly.com/uploads/1/3/4/3/134346543/11539067c36a.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/7bfa60ab-a69a-479e-a49b-6c0c19846c59/rudunemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b3b1a60-8e23-40d7-89a3-e9b7182947ad/microsoft_visual_basic_error_1004_excel_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22af3ef3-0a86-4e38-ba0d-73653475d85e/pathfinder_kingmaker_magic_weapon_spell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c57669bb-461b-49ae-9361-3cc3b21408ba/bosch_silence_plus_48_dba_water_not_draining.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca3ea8d6-4991-4b28-bf2b-efdbc3e7c379/gta_san_andreas_indir_cretsiz_gezginler_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a23d651e-fdd3-4290-b6ff-5db789627d3f/kawasaki_fh580v_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3897481-f24a-4de7-ad0a-8cbc400aa452/17062677631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c85fde82-dd0e-4145-b335-e8a61f4fee08/41223880572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c00f9712-2b9e-4c4a-9a55-2ada57ecdb9c/99651940284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b436dc2-cfdc-4f9c-9094-9685474b2d1e/spyder_imagine_select.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f08c75f7-1183-421f-ae5d-cae697222369/gazemubegosajoparedalerig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a93df527-2e7e-428b-bfc9-d5bc09831685/2016_chevy_malibu_lt_led_headlights.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fabeb85-7dec-491f-aa15-6ea0aca71fa3/zofekojexotiserotofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f23c31cc-e1b7-4685-9e99-ff664cc9a6bd/batidora_kitchenaid_modelo_k5ss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f3f7e85-f172-474a-bef6-b690c0038c09/77238191937.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_off0000f0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 5508 bytes
SHA-256: 1c5ac0ec5b3e5a29726ec3111fe4bf62dd24264a74690b16120bd0446681c015
font_01_sfnt_off0001035f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 12868 bytes
SHA-256: c54ee55c6a4c6b5ddc72ff6adb8bf8ed4ccf91bae67bdb6caf64c7ac2b81aba9