Malicious PDF — malware analysis report

Static analysis result for SHA-256 8edca6501870011e…

MALICIOUS

PDF

76.0 KB Created: 2021-02-21 07:08:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 77a5c84d176695baa80d2b3876b10cea SHA-1: ebf7534ad1925724acce5cbcd9fa0f13afb53c3e SHA-256: 8edca6501870011e76587fa578b5da1f9f2299dd961c628ef11623e1c058ebc7
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links pointing to external PDF files, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. Heuristics confirm it's a malicious redirector and a link farm on disposable hosting. ClamAV also detected it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=breville+juice+fountain+elite+recipes In PDF document text
    • https://visofamawuri.weebly.com/uploads/1/3/2/3/132303269/39624d18b0.pdfIn PDF document text
    • https://cdn.sqhk.co/godanalumado/iKjcWdx/bigudaridabetexam.pdfIn PDF document text
    • http://miwopejodap.iblogger.org/61209910875.pdfIn PDF document text
    • http://smallita.space/asrock_z390_pro4_manualccomt.pdfIn PDF document text
    • https://cdn.sqhk.co/penomufepuk/jShgibR/98119758550.pdfIn PDF document text
    • https://cdn.sqhk.co/kixowijeka/8YA1DSW/31399410743.pdfIn PDF document text
    • https://cdn.sqhk.co/bijilixiger/auhehj9/whatsapp_status_viral_video_tamil_download_30_seconds.pdfIn PDF document text
    • http://twobigs.space/747933315048o092.pdfIn PDF document text
    • https://cdn.sqhk.co/nupumusu/iihfggG/ding_dong_roblox_id.pdfIn PDF document text
    • https://jerusofiv.weebly.com/uploads/1/3/0/9/130969981/xukejudeduda.pdfIn PDF document text
    • https://cdn.sqhk.co/korulifesewa/dEjhjjc/wipawanakamu.pdfIn PDF document text
    • http://herss.space/acknowledgement_for_college_projectro5rr.pdfIn PDF document text
    • http://world-wild-shop.com/final_fantasy_record_keeper_kingdom_heartst81rn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jegelafaxorew.rf.gd/graphs_and_charts_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/dabifedotowomanez.pdfIn PDF document text
    • http://tugupora.epizy.com/40043692136.pdfIn PDF document text
    • http://vuxonisozezuxov.rf.gd/wesuwilawexexakada.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/povajusevuzagonurezo.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_off0000e2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F7 5192 bytes
SHA-256: 04487570ab5c22595430e2e93057fad4ac93ec32f0a02bb01211f5e6feed646d
font_01_sfnt_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0000fd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD47 11004 bytes
SHA-256: 7dccc4dea16a7a0c0836317f2d3155bde8dbd8b9e6af48186dfaa61889c709cd

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