Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c3e1a4334e5b27…

MALICIOUS

PDF

76.1 KB Created: 2021-04-04 06:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 00558c252b5ead1e1a367b7c50cd4775 SHA-1: ec284b24b5c8dd9d733b0c579b33ab6f9b3e8538 SHA-256: 06c3e1a4334e5b27ea89f3e30055a2d5db110a75688931b8e3c5b800c1074e03
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 0.9996

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://jacksth.ru/award?keyword=ultracentrifugation+definition+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418184/normal_5feba47acf343.pdfIn PDF document text
    • https://giravegide.weebly.com/uploads/1/3/2/6/132681237/874848d.pdfIn PDF document text
    • http://beremoter.online/75002542810fclt8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412570/normal_605c70417635a.pdfIn PDF document text
    • https://pogedufofow.weebly.com/uploads/1/3/4/5/134512351/datojepage.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/samsung_smart_tv_powered_by_android4py41.pdfIn PDF document text
    • https://bopunesarikimar.weebly.com/uploads/1/3/1/4/131453984/telitavuxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388432/normal_60253b4d08158.pdfIn PDF document text
    • https://votorivoxezi.weebly.com/uploads/1/3/4/0/134095847/gilibut_lufomaf_laral_nibatasiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_603eb53c38fdc.pdfIn PDF document text
    • http://gezowipefu.22web.org/35303580492.pdfIn PDF document text
    • http://vizit.store/zixujaforavanuwajumovap9g91u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://leribilif.rf.gd/badlapur_songs_320kbps_djmaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f4fa66a-f895-4eb4-bfaa-5eed08c6089f/girakufidume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/557e8efe-39c5-496a-b816-25babbf4b58b/what_are_the_key_elements_of_a_poem.pdfIn PDF document text
    • http://xetupukofomapi.rf.gd/human_anatomy_and_physiology_lab_manual_13th_edition_fetal_pig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c1ec732-09a9-4fd3-8e14-470c547f0039/96849715679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2b8e8db-4fac-4ecd-b302-ca853aa16050/sobopipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7eb6184-e39a-4865-a3c1-36e44997436e/what_is_dark_they_were_and_golden_eyed_about.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/380a4dc7-77ac-456b-845b-6ad19bcea484/zezodapuponase.pdfIn PDF document text
    • http://wojotefeva.rf.gd/hvac_load_calculation_excel_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 5016 bytes
SHA-256: a1b2fb296b65227399661307ffeb37411bbc4a633530af6b95e635292d5e1a28
font_01_sfnt_off0000ec7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 11796 bytes
SHA-256: 653d6e6a962bd134586e6b24c365f4314a7037f712105205444dd1a7be2a04df
font_02_sfnt_off00011338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11338 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c