Malicious PDF — malware analysis report

Static analysis result for SHA-256 540dd234004915a8…

MALICIOUS

PDF

73.6 KB Created: 2021-02-15 12:31:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f968daf24bb3ba742a0b0515867c99f9 SHA-1: 5af824a83e3b05297b55a78cd41ba16448163880 SHA-256: 540dd234004915a8739286ca477aae438acf7a5653b93d5f63df123bd77005b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting domains, suggesting a link farm or redirection scheme to deliver malicious content. The document body, though truncated, presents a lure related to 'winter wonderland table setting ideas' to mask the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/strik?utm_term=winter+wonderland+table+setting+ideas PDF link annotation
    • https://cdn.sqhk.co/lidumezuvir/gfgfje8/good_vanilla_cupcake_recipes_from_scratch.pdfIn PDF document text
    • https://cdn.sqhk.co/kafufojugure/fifcQjc/2846355868.pdfIn PDF document text
    • http://afracheat2.xyz/asphalt_6_2d_apk_androidbbg6g.pdfIn PDF document text
    • http://molotkov.site/fenunirikca2y.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxunoromi/hcjiinj/tebalewix.pdfIn PDF document text
    • http://mandarins.space/6176889408332zjv.pdfIn PDF document text
    • http://it50discount.pro/catatonia_scalevt01i.pdfIn PDF document text
    • http://wowitaly.pro/82515972880dcrv7.pdfIn PDF document text
    • https://segamivudafipem.weebly.com/uploads/1/3/2/7/132740242/4026287.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vezuzatutuxi.epizy.com/tujhko_chalna_hoga_song.pdfIn PDF document text
    • http://jabaxuzadowepep.rf.gd/25982543309.pdfIn PDF document text
    • http://zepedijuva.epizy.com/aspekto_ng_pandiwa_worksheets.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_off0000d9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D7 5240 bytes
SHA-256: c678ac7726827d7d5b64e5ab495eb61a564c74227ef36a9fbd0a720c44c0cf42
font_01_sfnt_off0000ebc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0000f44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44F 10828 bytes
SHA-256: 157459b5ef4516b28ee78aef478872a68aa8eadcafc01810535e9cfc64da6132

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