Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd693ae0e12562da…

MALICIOUS

PDF

82.2 KB Created: 2021-02-13 09:41:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 467304fb058cefffe8bc4b6c8933e929 SHA-1: c960558f3aa2551826da38e12b9eebfc7824a2f3 SHA-256: bd693ae0e12562da1c1d69d1fe5269a63f917cf3b37f8bf313ee51b5f0c5dd7b
184 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are flagged as redirectors to malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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/aws?utm_term=soil+colloids+and+cation+exchange+capacity+pdf In PDF document text
    • http://medicinfo.online/dr_lynette_buschbacher_military_histx1zz4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462727/normal_5fcbf99260c26.pdfIn PDF document text
    • http://zelopaqq.xyz/mikanoxezubaory91.pdfIn PDF document text
    • http://meetdouche.xyz/7372959989893fai.pdfIn PDF document text
    • http://ogranifruit.space/56215801753i1c0r.pdfIn PDF document text
    • http://smirno.life/tecnologias_de_la_informacion_elizondo_sarabia2rf65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465144/normal_5fe5bc1341ded.pdfIn PDF document text
    • http://gofimowekes.66ghz.com/42207725090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477163/normal_5fd157da21207.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464080/normal_5ffe8029bce4b.pdfIn PDF document text
    • http://eu-study.ru/bilurizawuxamotepadiajr9d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jilutuve.rf.gd/gejunuz.pdfIn PDF document text
    • http://runoxujozu.rf.gd/buying_a_house_in_france_guide.pdfIn PDF document text
    • http://bigofufujenu.epizy.com/structural_isomers_worksheet.pdfIn PDF document text
    • http://gedokimisizat.rf.gd/11113960196.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_off0001009c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009C 5592 bytes
SHA-256: dbf2d140a62d8d5d777170d03e40523b82f6fbb66b6a2c1ddac7f4b1d364e293
font_01_sfnt_off000113b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B4 12112 bytes
SHA-256: 75a31f436f72adb526e4d2e41ea0686f31875a1eb30548f5f0f45f64447f3836

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