Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a949875da0bb8e…

MALICIOUS

PDF

75.1 KB Created: 2021-03-29 14:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 74b3682e3d988a5587a81578d5979709 SHA-1: e491674ff4e8dfe360f7aa1306109d50b3078649 SHA-256: a0a949875da0bb8e09e922228956b68bc0ad1400823db3976da4f82428a2dbd9
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 0.9991

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://leonvi.ru/wix?keyword=andy+carpenter+series+characters PDF link annotation
    • https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/muwekojorol_kupisuvikodibo_golefuribu.pdfIn PDF document text
    • https://fixubosadad.weebly.com/uploads/1/3/4/6/134658154/500894d6d1.pdfIn PDF document text
    • https://pigoresaj.weebly.com/uploads/1/3/4/5/134589591/f49e13a83635.pdfIn PDF document text
    • https://vizijupazikek.weebly.com/uploads/1/3/2/8/132814338/2d87cc43c37dc.pdfIn PDF document text
    • https://todijaxazifaro.weebly.com/uploads/1/3/4/3/134342800/937798186.pdfIn PDF document text
    • https://rezisepadas.weebly.com/uploads/1/3/4/2/134235668/fefazozufuvej-piwepo.pdfIn PDF document text
    • http://doctorzlo.com/50550804923vf3o2.pdfIn PDF document text
    • http://goodsun.fun/15_freeway_accident_reportjw3t9.pdfIn PDF document text
    • https://takixesa.weebly.com/uploads/1/3/4/6/134621412/76766aa5.pdfIn PDF document text
    • http://latencfsrt.space/zekidumilasupoferijukexizz9be1.pdfIn PDF document text
    • http://airet.space/35548896282padbp.pdfIn PDF document text
    • https://fakegegi.weebly.com/uploads/1/3/5/3/135312823/xiwititaw_zozuje_lamipajobevebe_gijifiti.pdfIn PDF document text
    • http://juilopkiretlo.ru/libuxetolexavugaredeseqh2p4.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/fcd3c63c-ef35-4da9-8c2c-94b990da73ff/9110232709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd99fcbe-e8ef-4e92-80f6-dc0a8773235d/39297023251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acdffd82-3548-4108-ae90-549566ded886/25110724703.pdfIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_5da36d470fd347ef957f601acf112628.pdf?index=trueIn PDF document text
    • https://c0a42e0f-4cce-4e1b-84a6-2a5440198d67.filesusr.com/ugd/440b6d_29e8de9d181c4cd7a2af13e4dd21c443.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aaeee79-ff6d-41f7-923e-307effb9bc74/mq_error_2538_amq4059.pdfIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_e191bcf18ddb47e5b991ab3642a1a1ba.pdf?index=trueIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_da6af22b50cb491895af6a9f6178972d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/043b8bc0-ee2b-4b66-ac95-75a69927eae0/percy_jackson_movies_streaming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8ed6581-2e0c-4609-93c8-b8743b8a66cd/how_our_five_senses_impact_perception.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0216d02e-63e0-4474-afba-3f323ed6c160/the_ancient_magus_bride_ep_5_vostfr.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_off0000e80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80B 5220 bytes
SHA-256: 051fe849bb7db7c4bbbb73d5d2fee12e891559fa0320a17690bea8509fc9f472
font_01_sfnt_off0000f9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 10692 bytes
SHA-256: b1d4c91e61b8b83d3fc64235f42f6098c4735b34799968257e9369c375a925d1