Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d05d5a0d9a6940…

MALICIOUS

PDF

67.4 KB Created: 2021-03-18 11:41:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a212670f62d9a51cd197a358c81287e0 SHA-1: 9151d21566bf323a6dc3a42ff9b92e3258ade60e SHA-256: a1d05d5a0d9a6940c4a25bd91a1409bfa814304a4ad087801a19441eec33ccc8
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://druttle.ru/aws?utm_term=how+to+put+casio+fx-115es+plus+in+radian+mode PDF link annotation
    • http://pifafixejizigu.scienceontheweb.net/anti_corruption_act_in_gujarati.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/hbbsieN/pesujazofezizowodigaxiwi.pdfIn PDF document text
    • https://rivelipa.weebly.com/uploads/1/3/5/3/135349188/dirojabipafaxufuti.pdfIn PDF document text
    • https://bixirugabo.weebly.com/uploads/1/3/0/9/130969405/ruxuses.pdfIn PDF document text
    • https://feziriwavejoli.weebly.com/uploads/1/3/4/0/134096108/namefuvini_lokanexamukafe_bituxuwajumufo_jirepiviniwa.pdfIn PDF document text
    • https://nitipitu.weebly.com/uploads/1/3/0/7/130775162/kasevegijikojab.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/nikon_55-200mm_af_s_dx_vr.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/gcKidgf/najukolufewusekej.pdfIn PDF document text
    • http://lisuzigerob.mygamesonline.org/mesaja.pdfIn PDF document text
    • https://befibexa.weebly.com/uploads/1/3/0/9/130969759/wizug.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/mini_dv_camcorders_for_sale_uk.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/1795f454-3488-408d-af01-83186dd15d30/how_to_set_default_zoom_background.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/jogos_para_pc_fraco_windows_7.pdfIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_575f620957f74ad492a3f3caf79c75d0.pdf?index=trueIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_ce1019e3aaac42d4a2b8f0d62180cb56.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxorojero/85428894647.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_5a4b4de264d44f15905274091f705406.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kudefem/53494142904.pdfIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/wabifetazipo.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/19223399762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0a7419e-6ff2-4cbc-9333-c8921ed2b486/dd_unearthed_arcana.pdfIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_4bb6f73ed84f4b5a998162bdf83852c7.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_off0000ca4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4B 5632 bytes
SHA-256: 0afc4c55fee80afce5d6a80d901d30d596946c72c0c95a6ec32f274117152bad
font_01_sfnt_off0000dd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD82 10040 bytes
SHA-256: da197c595d7207d6bbef601f22395552fcea22168301e2fa1fc54ac78fde1ae4